with the two lower ones, 4...%. Devonshire and 
British Channel, 
C. Orpicunata. Turt. B. p. 138.—Venus O. 
Mont. Sup. p. 42. €. 29. f. 7.—Pen. 4. p. 208.— 
Turt. C. C. p. 241.—Cytuerea O, F, p 446.— 
Orbicular, compressed, cancellated, white; beaks small, 
lunule minute and cordiform; margin plain ; two ap- 
proximating teeth, and a transverse and rather remote 
one where the margin is angular, 3, Dunbar. 
Genus. —_CYTHEREA, 
Kquivalve, inequilateral, suborbicular, trigonal and 
transverse ; one valve with four primary teeth, of 
which three are divergent and approximate at their 
base, and one remote ; three primary divergent teeth: 
in the other valve, with a hollow margin parallel. 
C. Cutone. Lam. 22.—Bl. t. 74. f. 5.—Turt. B. 
t.3.f. 11. p. 161.—F". p. 445.—Venus C. Lin. 1131. 
—D. p. 178.—Ch. f. 343.—Pen. 4. p. 206, t. 54.f7 2. 
— Don. t.17.—Mont. p. 115.—Lin. T. 6. t. 17. f.1, 
2, and Vol, 8. p. 84.—Dor. Cat. p. 35. €. 6. fi 7.— 
Turt, C.D. p. 239.—Da Cost. p. 184. t. 14. fi 7.— 
Oval, heart-shaped, glossy, smooth, fulvous with obsolete 
rays; lunule-oblong, acute and raised in the middle; 
cartilage cleft broad; epidermis awny chesnut, 3...4. 
WV. Coasts. 
