CARDITA.— Plate IV. 



squamosis ; posticis magnis, subdistantibus, longitudi- 

 na/iter striatis, anticis minoribus, approximatis ; la- 

 tere antico brevissimo. 



'1'hf. sharp-scaled Cardita. Shell ovately oblong, 

 yellowish, spotted with black or brown, and covered 

 with an olive-green epidermis ; ribs eighteen in 

 number, angulated in the middle, and furnished 

 with sharp scales; posterior ribs large, rather distant 

 and longitudinally striated, anterior smaller and ap- 

 proximating ; anterior side of the shell very short. 



Sowerby, Pro. Zool. Soc, 1832. 



Hab. Islands of the Pacific Ocean (found attached to 

 and under stones on the beach of Crescent and 

 Rapa Islands) ; Cuming. 

 This species, which was described originally by Mr. 



Sowerby from very rubbed specimens, is peculiar in 



having the ribs angulated down the middle. 



Species 19. (Fig. a, Mus. Stainforth ; Fig. b, Mus. 

 Cuming.) 



Cardita rufescens. Card, testa elongato-ovatd, antice 

 brevissimd, fuh'O-rufescente, epidermide ol'waced in- 

 dutd; costis septemdecim vel octodecim, imbricato- 

 squamosis , squamis incumbenlibus. 

 The red Cardita. Shell elongately oval, very short 

 anteriorly, yellowish bright red, covered with an 

 olive epidermis ; ribs seventeen or eighteen in num- 

 ber, imbricately scaled, scales lying one over the 

 other. 

 Lamarck, Anim. sans vert. (Deshayes' edit.), vol. vi. 

 p. 431. 



Hab. ? 



This and the Senegal shell may prove to be varieties 

 of one and the same species, though I feel scarcely in- 

 clined to admit them as such at present. 



Species 20. (Mus. Metcalfe.) 



Cardita volucris. Card, testd elongatd, postici va 

 gibbosd, angulatd, antice brevi et coarctato-acu, 

 natd ; viridescente albidd, postice nigra nigro 

 maculatd ; costis septemdecim, anticis p/anula 

 marginem versus evanidis ; posticis angulatis, hit 

 illic obsolete squamosis. 



The flying-bird Cardita. Shell elongated, very g 

 bous posteriorly, short, and contractedly acumina 

 anteriorly ; greenish-white, posteriorly black < 

 black-spotted ; ribs seventeen in number, the 

 terior ones flat, fading into each other towards 

 margin ; the posterior angulated, and here and th 

 obsoletely scaled. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. ? 



Care should be taken not to confound this species w 

 the young of the C. pectunculus. It is a solid well-de 

 loped shell, and never exceeds an inch to an inch an 

 half in length. 



Species 21. (Mus. Metcalfe.) 



Cardita gibbosa. Card, testd ovato-oblongd, soli 

 gibbosd ; alba, costis septemdecim, fusco-variegai 

 transversim radiantibus, rotundatis, exiliter nodiilo. 



The gibbous Cardita. Shell ovately oblong, sol 

 gibbous ; white, ribs variegated with brown, sev< 

 teen in number, radiating transversely, rounded, a 

 covered with small nodules. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. ? 



This is a solid gibbous shell, the anterior side of whi 

 is not so short as in most of the oblong species of t 

 genus. 



