123 
covered with numerous raised pustular dots, the under 
valve flat and marked with concave dots; beaks ter- 
minal. 1. Tergnmouth, §c. on Crabs, &c. 
A. Cyuinprica. Turt. D. p. 6.—Turt. B. p. 232. 
—F. p. 396.—A. CymsBirormis. Lin. T. 8: p. 104 €. 
3. f.6.—Mont Sup.p.64.—An. A. Pyrirormis. Lam.? 
—Oval, somewhat cylindrically convex and transversely 
rugged, but often smooth, brownish, narrower towards 
the beak which curves over the under valve and ends in 
an obtuse point. ¢...3. On Fuci and Sertularie. 
A. Striovata. Turt. B. p. 233.—F. p. 396.— 
Oval, somewhat cylindrically convex and striated Jon- 
gitudinally, with the beak curved backwards. Roots of 
Fuci. 
A. AcuLeata. Gmel. 3346.—Ch. f. 702.—Mont. 
p. 157. t. 4. f. 5.—Pen. 4. p. 233.—D. p. 288.— 
Turt. D.p. 4.—F. p. 396.—Turt. B. p. 233°—Flat, 
rounded or oblong, sometimes truncated at the top, 
brown or whitish, armed with numerous radiating 
prickly striaz on the upper valve. 0,40. Dover, §e 
A. Fornieata. Lam. 6.—Turt. B. p. 234. ¢. 18. 
f. 1,2,3.—F. p. 396.—Orbicular or inclining to 
FE 2 
~~ 
