Sh 
Turt. C. D. p. 235.—V. Danmonta. Mont. sup. p. 
45. t. 29.f. 4.—D. p. 167.—Cras. Sut. Turt. B. p. 
131. ¢. 11. f. 1,2.—Artarte 8. & D. F. p. 489.— 
Rounded heart-shaped, rather compressed, white under 
a dark brown cuticle, with smooth, strong, regular, equi- 
distant, transverse ridges; beaks subcentral, and in- 
clining; lunule subcordiform, lozenge lanceolate. 
1...14. Devon and Ireland. 
TRIBE.~CONCHACEA, 
With at least three cardinal teeth inone valve, usually 
but not always the same in the other. 
Grenus.—CYPRINA. 
Hquivalve, inequilateral, obliquely heart-shaped, beaks 
obliquely bent; hinge with three unequal teeth, 
approximate at the base and slightly divergent 
above ; lateral tooth remote (sometimes obsolete) ; 
ligament external and partly sunk between the 
beaks. 
C. Isuanpica. Lam, 2.—Turt. B. p. 135.—F, p. 
443.—Bl. t. 70. bis. f. 5.— Sow. G.—Reeve. t. 65.— 
Venus T. Lan 1131.—D. p. 176.—List. €. 271. f. 
108.—Ch. f. 341.—Pen. 4. p. 205. t. 56.—Mont. p. 
114.—Don. t. 77.—Lin. T &. p. 83.—Dor. Cat. p. 
35. #. 6. f. 9.—Turt. C. D. p. 238.—Da Cost. t. 14. 
Dic 
