A Conchological Manual by George Brettingham Sowerby (early reader books .txt) 📖
- Author: George Brettingham Sowerby
Book online «A Conchological Manual by George Brettingham Sowerby (early reader books .txt) 📖». Author George Brettingham Sowerby
any shells which are marked by ridges crossing each other as
Cancellaria, fig. 385.
CANCILLA. Sw. A sub-genus of Mitræ, described as having "the whorls
crossed by transverse linear ribs; inner canal wanting, plates very
oblique; form slender; outer lip thin." _Ex._ M. Isabella, M. sulcata.
CANCRIS. Montf. CREPIDULINA, Bl. A genus of microscopic Foraminifera.
CANOPUS. Montf. A genus of microscopic Foraminifera.
CANTHAPLEURA. Guild. A genus composed of those species of Chiton, which
have the mantle rough, with moveable spines, prickles, or hairs. _Ex._
spinosus, fig. 227.
CANTHARIDUS. Montf. TROCHUS IRIS, Auct. and analogous species.
Elenchus, Humph.
CANTHARUS. Montf. A genus of microscopic Foraminifera.
CANTHIDOMUS. Sw. A sub-genus of Melanopsis, thus described: "spire
generally short; whorls coronated with spines, or marked with
longitudinal ribs; base obtuse. C. costata, Sow. Gen. f. 3." Melanopsis
costata, plates, fig. 315.
CANTHORBIS. Sw. A sub-genus of the sub-family Trochinæ, Sw. Described
as being "nearly disc-shaped: spire but slightly raised; the margin of
the body-whorl flattened, and serrated with flat spines; inner lip
united to the outer; pillar and aperture as in the last. (Tubicanthus.)
imperialis. Mart. 173. f. 1714." This sub-genus appears to includethose species of which De Montfort's genera Imperator and Calcar are
formed.
CANTHROPES. Montf. Described as resembling a Nautilus, with the whorls
increasing so gradually, that the dorsal edge of the aperture advances
but little beyond the last whorl. This genus is not mentioned by
Blainville or Lamarck.
CAPITULUM. Klein. POLLICIPES Mitellus, Lam. fig. 37*.
CAPRELLA. ----? PLEKOCHEILUS, Guild. AURICULA Caprella, Lam.
CAPRINA. D'Orb. DICERAS. Auct.?
CAPRINUS. Montf. (Conch. Syst. t. 2. p. 143.) The figure appears to be
intended to represent Helix Nux-denticulata.
CAPSA. Brug. _Fam._ Nymphacea, Lam.--_Descr._ Equivalve transverse,
subequilateral, subtrigonal; cardinal teeth, two in one valve, one
notched in the other; lateral teeth remote, obsolete; an external
ligament; two muscular impressions in each valve; a large sinus in the
muscular impression of the mantle.--_Obs._ This genus is so nearly
related to Donax, that it is difficult to distinguish it at first
sight. The Capsæ, however, have not the short, plain, straight,
posterior side, the distinct lateral teeth, nor the crenulated margins
which characterize nearly all the Donaces. They are found in the
British Channel, Brazil, and coast of Pacific Ocean. They are known
from Erycina by not having the pit in the hinge for the ligament. Fig.
C. Braziliensis.
CAPULUS. Montf. _Fam._ Calyptracea, Lam.--_Descr._ Obliquely conical,
posteriorly recurved; apex pointed, sub-spiral; aperture large,
rounded, oval; with two muscular impressions, lateral, meeting behind;
epidermis horny, rather velvetty. Britain, Mediterranean, West Indies,
California, Australia.
CARDIACEA. (Cardiacées, Lam.) A family of the order Conchifera
Dimyaria, Lam. Most of the genera of shells contained in this family
are included in the very extensive family of Conchacea, in the system
of De Blainville. They are described as having irregularly formed
cardinal teeth, generally accompanied by one or two elongated lateral
teeth. Most of the species are ventricose, and have regular radiating
ribs. This family contains the genera Cardium, Cardita, Cypricardia,
Hiatella, Isocardia, and others enumerated in the explanation of
figures 122 to 130. Their characters may be thus explained.
CARDIUM. Two cardinal and two lateral teeth in each valve,
including _Hemicardium_, _Papyridea_ and _Aphrodita_, in the last
of which the teeth are nearly obsolete. Fig. 122, 123, 123*, 123**.
VENERICARDIA. Two oblique cardinal teeth, one elongated;
including _Cardita_, which has the umbones nearly terminal.
_Pachymya_ may probably be included, but the hinge is not known.
Fig. 121, 124, and 130.
HIPPOPODIUM. One elongated cardinal tooth. Fig. 129.
MEGALODON. Hinge broad, septiform, with a large tooth in the
centre of one valve. Fig. 127.
ISOCARDIA. Teeth laminar; umbones spiral. Fig. 126.
CARDILIA. The same, with a septiform posterior laminar tooth.
HIPPAGUS. Shaped like Isocardia, without teeth. Fig. 128.
CARDILIA. Desh. _Fam._ Cardiacea, Lam. A genus formed for the reception
of Isocardia semi-sulcata, Lam. and a small fossil shell, which
Deshayes had formerly named Hemi-cyclonosta Michelini; thus described,
(translation) "shell oval, oblong, longitudinal, white, heart-shaped,
ventricose, with large prominent umbones; hinge with a small cardinal
tooth and a pit at the side; a spoon-shaped projection for the
reception of the internal ligament; anterior muscular impression
rounded, not deep; the posterior being upon a thin, horizontal lamina,
projecting in the anterior." Deshayes further remarks that although the
animal is unknown, the relations of the genus may be established by
means of the shell alone. Two families contain all the shells which
have the internal ligament inserted in a spoon-shaped projection; in
the one, that of the Anatinæ, the ligament is supported upon a little
bone, which is not soldered to the hinge; in the other, that of the
Mactraceæ, this little bone has no existence. In the former, all the
shells are inequivalve; in the latter equivalve. And M. Deshayes,
considering that the valves are equal, and that there is no separate
bone to the hinge, is of opinion that the genus ought to be placed near
the Lutrariæ, and not far from the Anatinæ. C. semisulcata, fig. 501,
2.
CARDINAL MARGIN. The edge of a bivalve shell on which the teeth is
placed.
CARDINAL TEETH. The teeth upon the hinge directly beneath the umbones
of a bivalve shell, as distinguished from the lateral teeth, which are
placed at a distance on each side. In Venus, fig. 119, the cardinal
teeth, are marked by the letter c.
CARDIOCARDITES. Bl. A genus separated from CARDITA, Auct. Thus
described (translation) "oval species, with the inferior margin nearly
straight, or a very little inflated, crenulated and completely closed.
_Ex._ La C. Ajar, Adans Seneg. pl. 16. fig. 2."
CARDISSA. _Sw._ A genus composed of those species of CARDIUM _Auct._
which are heart-shaped. _Ex._ C. dionæum, fig. 122. And C. Cardissa.
CARDITA. Brug. _Fam._ Cardiacea, _Lam._ Submytilacea, Bl.--_Descr._
Equivalve, inequilateral, ovate, subquadrate or oblong, marked
externally by ribs radiating from the umbones and terminating in a
crenulated margin on the inner surface; cardinal teeth in one valve,
one long, thick, oblique; another short, more straight; in the other
valve one long, oblique, thick. Muscular impressions two in each valve,
rather oval; palleal impression not sinuated.--_Obs._ This description
includes Lamarck's genus Venericardia, which, although consisting of
the more oblong species, is not considered sufficiently distinct to
justify the separation. Cypricardia is distinguished from this genus by
a remote lateral tooth. Mediterranean, Africa, East Indies, &c. Cardita
calyculata, fig. 124.
CARDIUM. Auct. _Fam._ Cardiacea, Lam. Conchacea, Bl.--_Descr._
Equivalve, sub-equilateral, sometimes gaping posteriorly, ornamented on
the outside by ribs radiating from the umbones; cardinal teeth, two in
each valve, locked into each other crosswise, lateral teeth, two in
each valve, remote; muscular impressions, two in each valve; palleal
impression entire. Ligament external, inflated.--_Obs._ Although this
genus includes many remarkable forms, the characters are so easily
defined that there is no difficulty in distinguishing it from any other
genus. C. angulatum, fig. 123. C. Groenlandicum, fig. 123*. APHRODITA,
Lea. C. Hemicardium, fig. 123**. fig. 122. C. Dionæum. It is somewhat
surprising that this genus, which contains some of the most beautiful
forms of bivalve Testacea, should have been left till quite lately
without any attempt to revise the species and settle the synonyms. The
author of this Manual has endeavoured to remedy this defect by
publishing a catalogue of all the species hitherto known, which amount
to 97, including many new species described by him in the "Proceedings
of the Zoological Society," in 1840. Parts 46 to 51, 149 and 150, and
177 to 184 of his Conchological Illustrations contain figures of 60
species. Cardia are frequent in all climates.
CARINARIA. Auct. _Class_, Cephalopoda. _Division_, Monothalamia, Lam.
_Fam._ Nectopoda, Bl.--_Descr._ Symmetrical or nearly so, conical,
thin, glassy, fragile, patelliform; with a fimbriated dorsal keel; apex
convolute, bent forwards; aperture oval, pointed at the dorsal
extremity. _Hab._ Amboyna, Indian Ocean, and Mediterranean Sea.--_Obs._
A most singular and beautiful shell, remarkable for its transparency,
its fragile structure, and the dorsal keel, whence it derives its name.
It was once so rare that a single specimen was known to realize one
hundred guineas. Fig. 488. C. Mediterranea.
CARINATED. (From _Carina_, a keel.) Applied to any shell having a
raised, thin ledge, passing round a whorl or any other part of a shell,
as in Carinaria, fig. 488.
CARINEA. Sw. A genus formed for the reception of OVULUM gibbosum, Auct.
and similar species, fig. 443.
CARINELLA. Adanson. LUTRARIA papyracea, Lam. LIGULA, Leach. _Fam._
Mactracea, Lam. Fig. 77.
CARINIDEA. Sw. A sub-genus of the genus Canthorbis, Sw. (Turbo.) thus
described, "Imperforate; spire pyramidal, acute; basal whorl concave
beneath, and carinated round its circumference; aperture oval, entire,
slightly angulated at the base of the pillar, which turns inwards. C.
concavus, Martini, 168, fig. 1620, brevispinosus? Sow. Gen. (Turbo,)
fig. 1."
CAROCOLLA. Auct. _Fam._ Colimacea, Lam.--_Descr._ Orbicular, depressed,
with the outer sides of the whorls angulated or keeled, whorls few;
peritreme reflected; columella contiguous to the axis; epidermis
thin.--_Obs._ This genus differing from Helix only in the whorls being
angulated, is hardly distinct enough from the latter to justify the
separation. In De Ferrusac's system these species constitute the
division Helicigona, of the genus Helix. C. Lamarckii, fig. 277. East
and West Indies, Philippines, South America and Europe.
CARTILAGE. See LIGAMENT.
CARYCHIUM. Müll. _Fam._ Auriculacea, Bl. Colimacea, Lam.--_Descr._
Oblong or cylindrical, with gradually increasing whorls, few in number;
aperture straight, short, with a fold on the columella.--_Obs._ This
genus of minute land shells differs from Auricula chiefly in the soft
parts. De Furrusac enumerates three species, C. Lineatum, C.
Corticaria, (_Odostomia_, Flem.) and C. Minimum, fig. 301. De
Blainville places it in his genus Auricula, as "species with two folds
and a posterior tooth on the columella," giving a figure of A. Mysotis
as his example, and quoting the name Phitia, Gray. Europe.
CASSIDARIA. Lam. (From Cassis) _Fam._ Purpurifera, Lam. Entomostomata,
Bl.--_Descr._ Oval, ventricose, spirally grooved and tuberculated, with
a short turrited spire and a large aperture, terminating anteriorly in
a recurved canal; outer lip thickened, reflected, undulated or
denticulated; inner lip expanded over a part of the body whorl and the
columella, with part of its lower edge free.--_Obs._ The recent species
of this genus are not numerous; the few fossil species occur in the
tertiary strata. C. carinata is found in Calc-grossier and London Clay.
In general form this resembles CASSIS, but is at once distinguished by
the canal, which does not turn abruptly back, but is slightly curved
upwards. ONISCIA (C. Oniscus, &c. Lam.) is distinguished by the
shortness of the canal, and the granulated surface of the inner lip.
Fig. 407. C. Echinophora. Mediterranean.
CASSIDEA. Sw. (from Cassis.) A genus composed of those species of the
genus CASSIS, Auct. which have the "aperture wide; outer lip never
broad or flattened, but sometimes slightly inflected; inner lip
spreading, but never dilated or detached beyond the base into a
prominent rim." East Indies. Ex. C. Glauca, fig. 411.
CASSIDULA. Humph. PYRULA, Auct.
CASSIDULINA. D'Orbigny. A genus of microscopic Foraminifera.
CASSIS. (A helmet.) _Fam._ Purpurifera, Lam. Entomostomata,
Bl.--_Descr._ Oval or triangular, ventricose, thick, generally
tuberculated, with a short varicose spire; aperture long, sometimes
narrow, with the outer lip thickened and reflected, generally
denticulated; the inner lip spread over the surface of the body whorl,
indented and incrassated at its inner edge; canal turned suddenly over
the back of the shell. _Hab._ Seas of tropical climates. The fossil
species are rare, occurring in the tertiary strata.--_Obs._ The large,
common species of this well known genus are used for shell cameos and
as ornaments on chimney pieces, grottos, &c. and are remarkable for the
triangular disc, presented by the inner lip, which, in many species, is
thickened and spread over the front of the body whorl and the angulated
outer lip. The smaller, more rounded species, which have widened
apertures, have been separated by Swainson, under the generic name
CASSIDEA. The C. rufa, coarctata, &c. are formed by Mr. Stutchbury into
a new genus under the name CYPRÆCASSIS, for reasons which will be
stated under the word. Cassidaria is distinguished by the gradual curve
of the canal. Fig.
Comments (0)