418 MOLLUSCA. CAKDITAD.E. Cardtta. 
5. C. similis. — Khomboidal, gibbose, transversely costated ; anterior part 
separated by a projecting serrated keel, lunette heart-sbaped, nearly tiat ; 
beaks involute. — Sower, Min. Concb. t. ccxxxii. f. 3 . — Inferior Oolite. 
Gen. VENERICARDIA. — Shell inequilateral, longitudinally 
ribbed ; hinge-teeth two, oblique. 
1. V. planicosta — Subcordate, very thick, smootb, ribs broad and flat, about 
20, expanding into each other towards the margin ; a few longitudinal teeth 
within the posterior edge. — Sower. Minv Conch, t. 1 . — London Clay. 
2. V. senilis — Obliquely cordate, thick, with large, convex, subimbricated, 
naked ribs; lunette obsolete — Park. Org. Rem. iii. 191. t. xiii. f. 15, 17. 
Soiver. ]\Iin. Conch, t. cclviii — In Crag. 
3. V. carinata . — Transversely oblong, with 20, nearly smooth, carinated 
ribs ; lunette obsolete. — Sower. Min. Conch, t. cclix. — In London Clay. 
4. V. deltoidea Deltoid, Avith rounded angles ; ribs 15, keel-formed ; hinge 
callous, beaks prominent ; lunette small. — Sower. Min. Conch, t. cclix. f. 1. 
— In London Clay. 
5. V. glohosa — Globose; costae 16 to 20, carinated; carinae tuberculated, 
tubercles compressed — (Chama sulcata, Brander, f. 100.) Sower. Min. Conch, 
t. cclxxxix. upper and middle figures. — London Clay. 
6. V. ohlonga — Transversely oblong, unequal sided, subquadrangular, gib- 
bose, with 13 knotted costae; length about tAvo-thirds the width; costae strong, 
obtuse, irregularly knotted, margin strongly toothed — Sower. Min. Conch, 
t, cclix. three loAA'er figures . — London Clay. 
7. V. chamceformis. — Convex, orbicular, with rather produced beaks ; rib& 
rugged, distant, about 14 ; hinge large — Sower. Min. Conch, t. ccccxc. f. 1. — 
In Crag. 
8. V. orbicularis — Orbicular, rather convex, concentrically striated ; ribs 
about 16, not close, crenated ; hinge small.— Min. Conch, t. ccccxc. 
£ 2. — In Crag. 
9. V. scalaris , — Orbicular subtriangular, depressed ; longitudinal sulci about 
20, linear, concentrically striated ; hinge-teeth long and thin. — Sower. Min. 
Conch, t. ccccxc. f. 3 — -In Crag. 
Gen. CRASSATELLA. — - Shell inequilateral ; hinge with 
two strong teeth in one valve, receiving one tooth from tlie 
other ; ligament inserted in a pit at the side of the teeth. 
1. C. sulcata — Ovato-elongated, transversely sulcated ; anterior side pro- 
duced, obliquely truncated, defined by a ridge ; edge-toothed within — (Tellina 
sulcata, Brander., f. 80.) — Sower. Min. Conch, t. cccxIa’’. f. 1. — In London 
Clay. 
2. Q. plicata — Oblong, ovate, concentrically and minutely plicated ; plicse 
reflected ; anterior side defined by an obtuse ridge, obscurely truncated ; 
margin toothed within Soever. Min. Conch. t.',cccxlv. f. 2. — In London 
Clay, 
