68 
C. D. p. 166. f. 18.—T. Jucosa. Brown in Wer, T. 
2. p. 506, t. 24. f. 2.,—PeTRicolA OCHROLEUCA. 
Lam.—Oboval, tumid, and broader posteriorly, flex- 
uous and preduced anteriorly; thin, brittle, white or 
brownish with numerous thin raised unequal strie, 
whose interstic:s ave minutely striated longitudinally ; 
teeth strong, elevated, two in one valve, a cloven tooth 
in the other. 1...1$. Ireland, rare. 
P. Porycona. Turt. B. p. 96.—F. p. 438.— 
TELLINA P. Mont. Sup. p. 27. t. 28. f. 4.—Turt. C. 
D. p. 180.—Somewhat erbicular, somewhat truncated 
and angular at one end, rounded at the other, with fine 
transverse strize and minute longitudinal ones, the mar- 
gin uneven; beaks not quite central ; in one valve two 
large distant teeth, in the other a large cloven triangular 
tooth and a small one near it. 4...é. Frith of Forth. 
P. Lasxryti. Turt. B. p. 89.—F. p. 438.—TeEx- 
LinA S. Mont. Sup. p. 28. ¢. 28. f. 3.—Oval-oblong, 
smooth, glossy, slightly contracted anteriorly, purplish 
white under a yellowish olive epidermis, rounded at one 
end, obtusely pointed at the other: two approximate 
sub-bifid teeth in one valve, a single tooth in the other. 
0,40...2, Frith of Forth. 
