10 AMERICAN CORBICULAD^E. 



Cyclas chilensis, D ORBIGXY, Voy. en Amer. 1846, 568, pi. 83, f. 11-13. 



Pisidium chilense, DESHAYES, Biv. Brit. Mus. 1^54, 284. 



Pera chilensis, GRAY, Brit. Mus. Shells of S. Amer. 1854, 69. 



Pisum chilense, DESHAYES, Biv. Brit. Mus. 1854, 284. 



Musculium chilense, ADAMS, Rec. Gen. II, 1858, 451. 



Corbicula chilensis, PRIME, Proc. Acad. Nat. Sci. Phila. 1860, 269. 



Pisidium angulatum, PRIME, Proc. Zool. XXVIII, 1860, 322. 



I have not seen any original specimens of this species ; but 

 from the description and figure given of it by M. D Orbigny, I 

 have no doubt that it is the same shell I described as new from 

 the collection of Mr. Cuming, under the name of P. angulatum. 



Compared with P. abditum, to which it bears a general re 

 semblance, it is smaller, a little more full, less elongated, and less 

 rounded laterally. 



10. Pisidium jamaiceiise, PRIME. Shell small, oval, short, 



subequilateral, somewhat compressed ; anterior side very 

 Fig. 76. little longer, somewhat narrower, tapering to a well-rounded 

 extremity ; posterior subtruncate ; beaks small, not promi 

 nent ; striae not perceptible, surface smooth, epidermis light 

 straw color ; cardinal teeth small, lateral teeth moderately 

 P.J^icense. developed. 



Long. 0.083 ; Lat. 0.075 ; Diam. 0.05 inches. 

 Hab. Jamaica, in the West Indies. (Cabinet of Prime.) 

 Cyclas pygmea, C. B. ADAMS, Contrib. Conch. 1849, 44. 

 Pisum adamsi, 1 DESHAYES, Biv. Brit. Mus. 1854, 284. 

 Musculium pygmeum, ADAMS, Rec. Gen. II, 1J858, 452. 

 Pisum pyymeum, ADAMS, loc. sub. cit. II, 1858, 660. 



A rare species. The only specimens I have seen are those in 

 my cabinet, which I received some years since from the late Pro 

 fessor Adams. Remarkable for its short, compact appearance. 



11. Pisidium pulchellum, DESHAYES. 2 P. testa ovata, inflata, 

 tenui, sublsevigata, epidermide viridescente, iuasquilaterali ; latere antico 

 elongate, rotundato ; latere postico brevi, obtuso ; intus albicante. 



Hab. South America, at Maldonardo in Uruguay. 



t 



1 Not to be confounded with Pisidium adamsi, PRIME (Cyclas nitida, 

 MIGHELS), from Maine. 



2 Not to be confounded with Cyclas pulchella, HANLEY, or Pisidium pul- 

 chellum, JENYXS, a variety of P. casertanum, POLL 



