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
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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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    SECTION III_CONCHIFERA LAMELLIPEDA. This Section is divided into Five Families, viz. Conchae, Cardiacea, Arcacea, Trigoniana, and Naiada. CONCH/E.—7 Genera. Three cardinal teeth at least in one valve, with as many, or less, in the other; sometimes with lateral teeth. The Conchae are divided into Fluviatiles and Marin®. concha: fluviatiles. Cyclas.—Shell ovate-globose, transverse, equivalve, the beaks tumid; cardinal teeth very small, sometimes scarcely perceptible; occasionally two in each valve, one of them plaited in two; sometimes only one plaited or lobed tooth in one valve, and two in the other: lateral teeth transversely elongated, compressed, lamellar_ Ligament external. Plate VI. Fig. 8. (a) C. cornea. (Tellina cornea.—Linn.) (b) Inside of ditto. Cyrena.—Shell rounded, triangular, turgid or ventricose, inequilateral, solid, covered with an epidermis; the beaks eroded ; hinge having three teeth in each valve; the lateral teeth are nearly always two in number; one of them often near the cardi¬ nal. Ligament external, inserted in the larger side. (a) Lateral teeth serrated or denticulated. Plate VI. Fig. 9. («) C. fluminea. (Tellina fluminea—Gmel.) (b) Lateral teeth entire. [I have not been able to procure a species belonging to this division, to make a drawing from.] Galathea*.—Shell equivalve, subtriangular, covered with a greenish epidermis: cardi¬ nal teeth sulcated; two in the right valve, approaching at their base; three in the other, the middle one advanced, and separate: lateral teeth distant. Ligament external, short, protruding, turgid; nymph® prominent. Plate VII. Fig. 1. (a) G. radiata. (Venus subviridis.—Gmel.) [Mr. G. B. Sowerby’s Cabinet.] (b) Hinge of ditto. * Galatliea having been appropriated to a genus of Crustacea, Bowdich has substituted Megadesma as a name for this genus.