86 
whitish, often tinged with red, thick, not polished, with 
cuarse uansverse ribs which become warty at the ex- 
tremities, crossed by indistinct radiating striz, which 
are usually apparent at the umbones; anterior slope 
more or less spotted on one side; lunule cordiform and 
wrinkled; inside white, 1%. English and Irish 
Coasts. 
*  V. Cassina. Lin. 1180.—D. p. 165.—Lam. 9,— 
Ch. f.301,2.— Lin. T. 8. p. 79. €. 2. fi 1.—Turt. C. 
D. p. 232.—Da Cos. p. 193, t. 13. f. 4. (left hand) 
Turt. B. t.9.f.1.p. 141.—F. p. 446.—Orbicular- 
heart-shaped, whitish or rusty brown,convex, with trans- 
verse smooth plates curving towards the hinge,and nearly 
meeting each other in an imbricated manner, but not 
reflected at the sides nor tuberculated ; lunule cordiform, 
1. W. and Irish Coasts. 
V. Discina. Lam. 6.—Philippi. p. 42.—BI. t. 76, 
J. 6.—V. Reriexa. Mont. Sup. p. 40. and 168.— 
Wern. Soc. 1. p. 384, t. 8. f. 1.—D. p. 168.—Turt. 
C. D. p. 233.—F. p. 446.—Turt. B. p. 142. t. 10. f. 
1,2.—V. RustEerucci. Payraydeau. f. 26, 7, 8.— 
Suborbicular, thickish, rather compressed, a little trun- 
cated anteriorly, where the transverse plates are thin 
and reflected, brownish white with usually two or three 
