46 TESTACEOUS MOLLUSCA. 



C. OvALiNA.f Lam. 4. Ovate, rather small, transversely 

 grooved, rayed with red : anterior side sub-acute. \. — New Holland. 



C. Tahitensis. Lam. 5. Ovate, trapeziform, biangulated, 

 rayed, with transverse scalariform grooves, and the interstices lon- 

 gitudinally striated. J. — Otaheite. 



C. Nucleus.* Lam* 6. — Sow. G. — Reeve, t. 36. f. I. — Mya 

 Inequivalvis. Mont. t. 26. /. 7.— -D. p. 3G.—E. t. 230. /. 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. -xo ,, tV — Europe, 

 Mediterranean. 1 



C. Porcina. Lam. 8. — E. 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 

 Ay res ?) 



C. Semen. Lam. 9. Very small, triangularly ovate, thin, pel- 

 lucid, and nearly smooth. ■£. — 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. 

 /. 3.— An. Ch. vol. 11. vignette 26. C. D. at p. \9b1—An. W. 

 t. 2.f. 12. Anatina Longirostris. Lam. 4. — An. C. Cus- 

 pida. Phil. t. l.jf. 19? Ovate-oblong, posteriorly gibbous, ante- 

 rior side the longer, attenuated and beaked ; white, brittle, dia- 

 phonous and finely striated concentrically; white within, f. .2. — 

 Adriatic ? 



C. Erodona. Desh. — Mya E. Lam. 3. — JDaud. Bosc. Hist. 

 des Coq. t. 2.f. 6. — Roissy. Hist, des Cog. 6. t. 69. f. 5. — An. 

 Ch. f. 1651, 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. ^. .^. — IV. Columbia. 



C. Rostrata. Brod. fy 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. \^ . 



C. Gibbosa. Brod. fy Sow. Z. J. 4. Obovate, equivalve, the 



1 C. 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." j. 



