83 



with the two lower ones. i...|. Devonshire and 

 British Channel. 



C. ORBICULATA. Turt. B. p. 138. VENUS O. 

 Mont. Sup. p. 42. t. 29. /. 7. Pen. 4. p. 208. 

 Turt. C. C. p. 241. CYTHEREA O. F. p 446. 

 Orbicular, compressed, cancellated, white ; beaks small, 

 lunule minute and cord i form ; margin plain ; two ap- 

 proximating teeth, and a transverse and rather remote 

 one where the margin is angular. I. Dunbar. 



GENUS. CYTHEREA. 



Equivalve, 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 t with a hollow margin parallel. 



C. CHIONE. Lam. 22. Bl. t. 74. /. 5. Turt. B. 



t.S.f. 11. p. 161. P.p. 445. VENUS C.Lin. 1131. 



D. p. 178. Ch.f. 343. Pen. 4. p. 206. t. 54./. 2. 



Don. 1. 17. Mont. p. 115. Lin. T. 6. t. 17. / 1, 



2. and Vol. 8. p. 84. Dor. Cat. p. 35. t. 6. / 7, 



Turt. C. D. p. 239. Da Cost. p. 184. t. 14. /. 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. 



W. Coasts. 



