126 
f. 5.-~ Ch. f. 687.—Criopus Anomatus. F. p. 377. 
—Suborbicular, posteriorly retuse; posterior scars 
rounded, anterior uniting into one; beak acute; disc 
sinuated; margin anteriorly irregular and thickened. 
z. Zetland, on submarine stones. 
Tripe.—BRAC HIOPODA. 
Shell bivalve, affixed to marine substances by contact 
or a tendinous cord. 
Grnus.— TEREBRATULA. 
Oval, inequivalve, fixed by a tendinous pedicle; the 
upper valve with the beak produced and perforated 
or emarginate ; under valve with two elongated 
projections issuing from the internal disc, which are 
sometimes variously branched ; hinge with two teeth ; 
ligament internal. 
T. Cranium. Mont. in Tin. T. 11. p. 188. é. 13. 
f. 2.—F. p. 368.—Turt. B. p. 236.—Anomia C. 
Turt. D. p.5.—T. Vitrea. Flem. in Edinb. Ency. 
7. p. 96. t. 206. f. 2.—Oval, ventricose, semitrans- 
parent, thin, brittle, finely shagreened and slightly 
wrinkled concentrically, under a dull white skin milk 
white,ventral edge slightly truncated ; the internal pro- 
jecting processes of the under valve with a lateral 
ramification issuing from the base on one side. 4. 
Zetland, rare. 
