46 TESTACEOUS MOLLUSCA. 



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

 grooved, rayed veith red : anterior side sub-acute. ■^. — New Holknid. 



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

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

 gitudinally striated. \. — Otaheite. 



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

 Inequivalvis. 3Iont. t. 26. /. 7—D. p. 3G.—E. i. 230. /. 4. 

 — W.t.^.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, -f-^..-^^.— Europe, 

 31editerranea n . ^ 



C. PoRciNA. Lam. 8. — E. t. 230. /. 3. Transversely oblong, 

 whitish and rather smooth ; hinge nearer to the posterior side which 

 is roiinded, 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 Cor hula and Pandora. 



C. RosTRATA. Desh.—An. Mya R. jD. p. 45 f. — Olivi. t. 4. 

 /. 3.— An. Ch. vol. 11. vignette 26. C. D. at p. 195 'i—An. W. 

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

 PiDA. Pldl. t. l.y. 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. Desk. — Mya E. Lam. Z. — D and. Bosc. Hist, 

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

 Ch. f. 1651, 2, 3 ? Ovate, anteriorly sub-rostrated : tooth naked 

 and straight, large. — Africa? 



C. BiCARiNATA. Sovi. Z. P. 1833. Ovate, rather depressed, 

 sub-equilateral, posteriorly rather longer, anteriorly with two keels 

 from the umbo to the venti-al margin, -^q. .-^q. — W. Columbia. 



C. RosTRATA. Brod. S)- 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. 5_o^ 



C. GiBBOSA. Brod, ^' 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." ^. 



