42 
&. p. 36.—Dor. Cat. p. 27. t. 4. f. 6.—Wood. G. C. 
p. 93.t. 18. fi. 3—A. Myaris. Lam. 9.—THracta. 
P. Kiener t. 2. f. 2.—Oblong, depressed, angular and 
truncate anteriurly rough, striated transversely, brownish 
white; beaks nearly central, the points crossing each 
other at the tips ; teeth projecting and running obliquely 
to the anterior side with a cavity or notch behind and 
small erect denticle inside, with an oblique rib from the 
tooth towards the truncated end. Torbay and Ply- 
mouth. 2%...3%. 
A. Truneata. Turt. B. p. 46. t. 4. f. 6. AMPHI- 
pesMA. T. F. p. 431.—Convex, wedge-shaped, poste- 
riorly very short and obliquely subtruncated, anteriorly 
attenuated and truncated; rough, striated transversely, 
dirty white; teeth projecting a little inwards but run- 
ning obliquely (thus distinguished from Distorta,) 
front margin forming nearly a straight line. 3%....4. 
In rocks, Torbay. 
* * Teeth projecting horizontally inwards. 
A. Dectivis. Turt. B. p.47.—Mya. D. Mont. t. 
1. f. 2.—Ampuipesma. D. F. p. 432.—Oval-oblong, 
slightly compressed, angular truncated and open an- 
teriorly, white, minutely shagreened, posteriorly broad 
‘and rounded. 1,...l. Torbay. Distinguished from 
