An illustrated introduction to Lamarck's conchology; contained in his Histoire naturelle des animaux sans vertèbres: being a literal translation of the descriptions of the recent and fossil genera / Accompanied by ... plates. By Edmund A. Crouch, F.L.S.

  • Edmund A. Crouch
Date:
1826
Catalogue details

Licence: Public Domain Mark

Credit: An illustrated introduction to Lamarck's conchology; contained in his Histoire naturelle des animaux sans vertèbres: being a literal translation of the descriptions of the recent and fossil genera / Accompanied by ... plates. By Edmund A. Crouch, F.L.S. Source: Wellcome Collection.

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    Creusia.—Shell sessile, fixed, orbicular, convex-conical, quadrivalve: valves unequal, united together, sutures distinct. Operculum internal, quadrivalve. Plate I. Fig. 16. (a) C. verruca. Outside. (Lepas verruca.—Linn.) (b) Inside. Pyrgoma.—Shell sessile, univalve, rather globular, ventricose, convex above; apex per¬ forated : aperture small, elliptical. Operculum quadrivalve. Plate I. Fig. 17- (a) P. crenata. Outside. (b) Inside. ORDER II_PEDUNCULATED CIRRHIPEDA. THE body is supported by a moveable, tubular pedicle, having the base fixed on ma¬ rine substances_This order consists of Two Divisions, viz. 1. The shell composed of contiguous pieces. 2. The shell composed of distant pieces. Division 1._Shell composed of Contiguous Pieces. — 2 Genera. Anatifera.—Shell compressed at the sides, composed of five valves, which are contigu¬ ous and unequal; the lower side valves the greatest. Plate I. Fig. 18. A. ltevis. (Lepas anatifera.—Linn.) Pollicipes.—Shell compressed at the sides, multivalve, valves rather contiguous, une¬ qual ; in number, thirteen or more: the lower side valves smallest. Plate I. Fig. 19. P. cornucopia. (Lepas pollicipes.—Linn.) Division 2—Shell composed of Distant Pieces.—2 Genera. Cineras.—Shell composed of five testaceous oblong valves, separate, not covering the whole of the body: two at the sides of the aperture; the others on the back. Plate II. Fig. 3. C. vittata. [Icon.—Wood’s Conch. Tab. XII. Fig. 2.] Otion.—Shell composed of two* testaceous small semi-lunate separate valves, adhering near the sides of the aperture. Plate II. Fig. 4. O. Cuvieri. (Lepas aurita.—Linn.) [Icon.—Wood’s Conch. Tab. XII. Fig. 4.] * This Shell has sometimes five testaceous valves; sometimes two testaceous, and three horny valves. Vide Sowerby’s Genera.