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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    (а) The cardinal teeth contiguous to the anterior end. Plate II. Fig. 13. S. truncatus. (Dillvvyn.) (б) The cardinal teeth a little removed from the anterior end. Plate II. Fig. 14. S. cultellus. (Idem.—Linn.) (c) The cardinal teeth nearer the middle than the anterior end. Plate II. Fig. 15. S. radiatus. (Idem.—Linn.) PanopjEa.—Shell equivalve, transverse, unequally gaping at the sides: one cardinal coni¬ cal tooth in each valve; and near it a short, compressed, ascending callosity, not projecting outwards. Ligament exterior, on the longest side of the shell, fixed to the callosities. Plate III. Fig. 1. P. Aldrovandi. (Mya glycymeris.—Gmelin.) [Mrs. Mawe’s Cab.] 2. Hinge of ditto. Glycymeris.—Shell transverse, gaping much on each side; hinge callous, without teeth; nymphae projecting outside. Ligament external. Plate III. Fig. 3. G. siliqua. (Mya siliqua.—Chem.) 4. & 5. Inside of ditto. MYARIA._2 Genera. Ligament internal; having one large spooti-shaped tooth in each valve or in one only; to the cavity of which the ligament is attached. The shell gapes at one or both sides. Mya.—Shell bivalve, transverse, gaping at each end; having one large cardinal tooth in the left valve, broadly compressed, rather rounded, and projecting almost verti¬ cally : a cardinal pit in the other valve. Ligament internal, inserted in the pro¬ minent tooth and the corresponding pit. Plate III. Fig. 6. M. truncata. (Idem.—Linn.) 7. Inside, shewing the hinge of ditto.. Anatina.—Shell transverse, nearly equivalve, gaping at one or both sides; one naked, broad, spoon-shaped cardinal tooth, projecting internally in each valve, and re¬ ceiving the ligament. In many species, a lamina or falcated rib runs obliquely be¬ low the cardinal teeth. Plate IV. Fig. 1. (a) A. myalis. (Mya declivis.—Pennant.) (A) Hinge of ditto. SECTION II_CONCHIFERA TENUIPEDA. The lateral gaping inconsiderable. The shells of this section compose Four Families, which are separated into Two Divisions, viz.—1. Mactracea and Corbulea, having the ligament internal, with or without any external ligament._And, 2, Lithophaga and Nymphacea, having the ligament always external.