Tript.—CORBULACEA. 
Inequivalve ; ligament internal; one of the beaks 
always projecting beyond the other. 
Gunvs.—COREULA. 
Regular, equivalve, mequilateral ; with a conical, bent, 
ascending, primary tooth in each valve, a small pit 
at its side ; destitute of lateral teeth; ligament ex- 
ternal. 
C. Nucrevs. Lam. 6.—Turt. B. p. 39. t.3. f. 8 to 
10.—Sow. G. f. 1.—Reeve. t. 36. f. 1.— Mya IneE- 
quivaLvis. Mont. p. 38. ¢. 26. f. 7.— Pen. 4. p. 126. 
—Lin. T. 8. p. 10. t. 1. f. 6.— Wood. G.C. p. 113.— 
D. p. 55.—Turt. C. D. p. 107-—E. M. t. 230. f. 
4.—Subtriangular, strong, opaque, generally covered 
with a brown skin under which it is whitish or flesh 
color, larger valve convex, regularly striated trans- 
versely, inclosing the lesser valve over which the beak 
projects and curves inwards; lesser valve flattish, with 
a few longitudinal raised strize : inside smooth, polished 
round the margin. 4....3. Torbay, ce. 
Genus.—_SPHENIA. Turton. 
Transverse, inequivalve, inequilateral, open at the an- 
terior side ; hinge of the left valve with an elevated 
transversely dilated tooth. of the right valve with a 
