a 
D. p. 96.—E. M. t. 291. f. 5,—Lam. p. 35.—List. 
b 299) F1S6.— Turt. By ps L097. Ff. 2.— Pip: 
436.—T. Proricua. and Fausta. Mont. p. 69. and 
64.—T. Rieina. Don. t. 103.—Suborbicular, thick, 
heavy, semitransparent, with one valve less convex than 
the other, anteriorly shorter ; white or yellowish (with 
usually narrow reddish rays) with crowded transverse 
furrows which become coarser anteriorly ; beaks‘ often 
pink; inside yellowish; a simple and bifid cardinal 
tooth in each valve, two lateral in one valve only. 4...2. 
S. Coasts. 
Grnus.—LUCINA. 
Sub-orbicular, inequilateral, beaks small, pointed and 
oblique ; hinge variable, sometimes with two diver- 
gent teeth, oneof which is bifid but changing with 
age ; two lateral teeth, the intermediate one obsolete ; 
the posterior nearest the primary ones: two distinct 
muscular impressious widely separated, the posterior 
one prolonged. 
L. Lactga. Lam. 12.—Turt. B. p. 112. €.7. f. 4,5. 
Tevirna L. Lin. 1119.—D. p. 99.— Bl. t. 72. f. 1.— 
Ch. f. 125.—Mont. p. 70. t. 2. f. 4.— Lin. T. 8. p. 56. 
—Dor: Cat. p. 30. € 5. f. 9.—Turt. C. D. p. 176.— 
Lorires L. F. p. 430.—Orbicular, equilateral, with 
fine irregular concentric striz, thin, rather compressed, 
