62 
GENus.—PSAM MOBIA. 
Transverse, elliptical or oblong-ovate, compressed, 
slightly gaping at one side; beaks prominent ; two 
cardinal teeth in the left valve and one in the oppo- 
site, no lateral teeth. 
P. TELLINELLA. Lam. 1.—P. Fioripa. Turt. B. 
p. 86. ¢t. 6. f. 9.—F. p. 437.— Oblong, nearly smooth, 
thin, subequilateral, anteriorly obtusely angulated, 
posteriorly rounded, yellowish, with either red inter- 
rupted rays or zones, but always with one small distinct 
posterior ray, which only proceeds a short distance 
from the beaks. 2...0,83. W. Coasts of Ireland. 
P. Costuata. Turt. B. p.87. t. 6. f. 8.—F.p.437. 
—P. Discors. Philippi.p. 23. t. 3. f. 8—Oval-oblong, 
thin, slightly angular anteriorly where there are about 
twelve fine oblique radiating ribs; color varying from 
pale yellow to deep purple and marked with crimson 
blotches or stripes ;_ transversely striated and minutely 
so longitudinally; beaks nearly central, a little promi- 
nent, not inclining to either side: hinge with a single 
cloven tooth in one valve locking into two in the other, 
one of which is slightly cleft. 2...1. Dredged in 
Torbay and the Channel. 
P. Fraciis. Turt. B. p. 88. t.7. f. 11,2.—F. p. 
448.—Trniina F. Lia. LIL7—Ch. f. 84.—Turt. 
