46 TESTACEOUS MOLLUSCA. 
C. Ovautina.t Lam. 4. Ovate, rather small, transversely 
grooved, rayed with red : anterior side sub-acute. 1.— New Holland. 
C. Tauitrensis. Lam. 5. Ovate, trapeziform, biangulated, 
rayed, with transverse scalariform grooves, and the interstices lon- 
gitudinally striated. 3.—Otaheite. 
C. Nucteus.* Lam. 6.—Sonw. G.— Reeve. t. 36. f. 1.—Mya 
Ineaurvatvis. Mont. t. 26. f. 7.—D. p. 36.—E. t. 230. f. 4. 
—W.t.3. f. 40. Somewhat triangular, sub-globose, the valves 
very unequal, the margin of the under valve projecting considerably 
over the upper, white, with a thick brown cuticle, strong, and trans- 
versely striated: beaks central and gibbous. ;',..2,.—Hurope, 
Mediterranean. 
C. Porcina. Lam. 8.—L. t. 230. f. 3. Transversely oblong, 
whitish and rather smooth; hinge nearer to the posterior side which 
is rounded, than to the anterior which is somewhat beaked trun- 
cated attenuated and angulated.— Mediterranean. (Buenos 
Ayres?) 
C. Semen. Lam.9. Very small, triangularly ovate, thin, pel- 
lucid, and nearly smooth. 2.—South Seas. This and the two 
preceding species are the links between Corbula and Pandora. 
C. Rostrata. Desh.—An. Mya R. D. p. 45 ?—Olivi. t. 4. 
Sf. 3.—An. Ch. vol. 11. vignette 26. C. D. at p. 195?—An. W. 
t.2.f.12. Anatina Lonerrosrris. Lam. 4.—An. C. Cus- 
pipa. Phil. t. 1. f.19? Ovate-oblong, posteriorly gibbous, ante- 
rior side the longer, attenuated and beaked; white, brittle, dia- 
phonous and finely striated concentrically ; white within. #..2.— 
Adriatic? 
C. Eropona. Desh.—Mya E. Lam. 3.— Daud. Bosc. Hist. 
des Coq. t. 2. a8 — Roissy. Hist. des Coq. 6.t. 69. f. 5.—An. 
Chi Ff wGois. 2,3 ? Ovate, anteriorly sub-rostrated : tooth naked 
and straight, large.— Africa ? 
C. BiCARINATA: Sow. Z. P. 1833. Ovate, rather depressed, 
sub-equilateral, posteriorly rather longer, anteriorly with two keels 
from the umbo to the ventral margin. {5..~5-— W. Columbia. 
C. Rosrrata. Brod. § Sow. Z. J. 4. Oblong, striated, 
posteriorly rounded, anteriorly sub-acuminated and beaked ; epi- 
dermis thin and horny: near the umbones two diverging dark red 
rays. 4°. 
C. Gresosa. Brod. 5 Sow. Z. J. 4. Obovate, equivalve, the 

1C. Impressa, Lam. 7, is held to be a variety of this species by 
Deshayes. Its characters are ‘ Ovate-triangular, turgid, trans- 
versely grooved, reddish-grey or purple: anterior slope depressed ; 
the posterior depression sunken.” 3. 
