History of British animals - University of Guam Marine Laboratory

Chama. MOLLUSCA. CHAMAD/E. 419CHAMAD^.Gen. CHAMA.— Beaks large, incurved, unequal; ligamentexternal ; hinge with one thick, oblique, subcrenated toothin one valve entering a pitin the opposite.1. C. haleotoidea.— Flattish, oval, uneven, with one longitudinal curvedline outside, and a deep curved hollow within the deepest valve, extendingfrom the beak around one side ; the remainder very shallow, margin thin,broad, slightly fringed, crenate within ; muscular impression large.— Sower.Min. Conch, t. xxv—Green Sand.2. C. canaliculata Oblong-oval, flattish, plaited ; deeper valve with a lateralcanaliculated projection—Sower. Min. Conch, t. xxvi. f. 1.— GreenSand.3. C. recurvata Deep valve conical, curved ; beak 'subinvolute—Sower.Min. Conch, t. xxvi. f. 2.—Green Sand.4. C. conica.— Oblong, curved ; larger valve deep, with a blunt conicalbeak, and a small wing lesser valve ; oval, flat, with a crenated marginwhiff.— andSower. Min. Conch, t. xxvi. f. 3—In Green Sand.5. C. plicata Transversely ovate ;beak short ; deeper valve with a narrowchannelled wing—Sower. Min. Conch, t. xxvi. f. 4—Green Sand.0. C. digitata Palmate, slightly recurved, gibbose, with 5 or 6 marginalelongated canaliculated processes; surface smooth—Soiver. Min. Conch.t. clxxiv Green Sand and Middle Oolite.7. C. squamosa. —Attached by the right valve ; nearly orbicular, subglobose,imbricated ;lamellae undivided, somewhat erect, anteriorly produced,and adpressed ; posterior part of the right valve obsoletely costated ; leftvalve rather convex; smooth within.— (Brander, 86, 87-) Sower. Min. Conch.t. cccxlviii.—London Clay.CARDIAD.E.Gen. CIX. ISOCARDIA.—Beaks distant, involuted, andinclining forwards ;hinge with two flat oblique teeth atthe beak, and a remote lateral one under the ligament.—430. I. Cor.— Shell tumid, smooth, brown, with the beaksclouded white.Bucardia,— List. Conch, t. cclxxv. Chama cor, Linn. Syst.i. 1 137-Mont. Test. Brit. 134. Laskey, Wern. Mem. i. 385. t. viii. f. 7—I-water on differentcor. Turt. Biv. Brit. 193. t. xiv Found in deepparts of the coast, burrowing in the mud.Length approaching 4 inches, and nearly as broad. Mr Bulwer has pointedout some differences between the individuals found on the east coast of Ire-D(12