118 



P. OBSOLETUS. Pen. 4. p. 222. t. 64. /. 3. Don. 

 t. I./. 2. Mont. p. 149. $ Sup. p. 61. Turt B. p. 

 213. t.9.f. 6.F.p. 385. OSTREA O.Lin. T. S. p. 

 100. D. p. 263. Turt. D. p. 133. OST. L^vis. 

 Lin. T. 8. p. 100. t. 3. /. 5. Equivalve, roundish- 

 oval or oblong, purple reddish or yellowish (rarely 

 clear white,) often variously marbled or spotted ; the 

 surface generally marked with raised ribs towards the 

 broader end, more or less in number, which are 

 sometimes denned by a deep transverse line separating 

 them from the plain part, but always marked with 

 fine and almost invisible longitudinal irregular and 

 somewhat undulate striae over the whole surface. Torbay 

 and English Channel. 



P. VARIUS. Pen. 4. p. 221 t. 64. /. 1. Mont. p. 

 U6.Lam. 47. F.p. 384. OSTREA V. Lin. 1146. 

 Dow. l.t.l.f. I. Lin. T.$.p.97.Dor.Cat.p.3$. 

 t. 10. /. 1,2,4,5,8,9. D. p. 260. Turt. D. p. 130. 

 Da Cost. t. 10. /. 1,2,4,5,7,9 Cft. /. 633,4. 

 List. t. 180, 181, and t. 189. /. 23. Rounded-oblong, 

 extremely variable in coloring, but not unfrequently 

 brownish red, with about thirty-two rounded prominent 

 radiating ribs, armed when perfect, with erect vaulted 

 scales, the interstices very deep and not striated ; ears 

 very unequal, li.long. Extremely Common. 



