F. p. 465. Oblong, smooth, glossy, all the teeth 

 erect. &...: Sand in Torbay, closely resembling the 

 last. 



GENUS. MESODESMA. DESHAYES. 

 Oval, transverse or triangular, and usually shutting 



close : hinge icith a narrow central spoon-shaped 



pit for the ligament, with an oblong and simple 



tooth on each sids of it. 



M. DEAUKATA. MACTRA D. Turt. B. p. 71. t. 

 5.f. 8. F.p.4'27 An MES. DENTICULATA ? Gray 

 in Grif. Cuv. An MES. JAURESII ? Mag. de Zool. 

 Oblong, flattish, inequilateral, rounded at the elon- 

 gated side and obtusely truncated at the other, opaque, 

 strong, dull greyish white under a shining bronzed skin 

 reflecting metallic lustres, coarsely and irregularly 

 striated transversely, with a few coarser ridges towards 

 the hinge; beaks rather prominent and pointed, a little 

 inclined to the longar side. I... \\. Exmouth, rare. 



M. DONACILLA. DeshinLam. AMPHIDESMA. D. 

 Lam. 2. DONAX PLEBEIA. Mont. t. 5./. 2. p. J07. 

 Turt. B. p. 127. Dor. Cat. p. 38. t. 5./. 13. 

 Turt. C. D. p. 1(2. F. p. 434. D. p. 102.-- 

 ERYCINA P. Sow. G.f. 3. Reeve, t. 45. /. 4 Ovate 

 triangular, wedge-shaped, posteriorly very short and 



