70 AMERICAN CORBICULAD^. 



Cijdas chihnsis, D'Orbigxy, Voy. en Amer. 1846, 568. pi. 83, f. 11-13. 



Pisidium chilense, Deshayes, Biv. Brit. Mus. 1854, 284. 



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



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



MuscuUum chilense, Adams, Rec. Gen. II, 1858, 451. 



Corhicula chilensis. Prime, Proc. Acad. Nat. Sci. Phila. 1860, 269. 



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



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

 from the description and figure given of it by M. D'Orbiguy, 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. ahditum, to which it bears a general re- 

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

 rounded laterally. 



10. Pisidium jainaicense, Prime.— Shell small, oval, short, 



siibequilateral, 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 



„ . . developed. 



P. jamaicetise. ^ 



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

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

 Ci/clas pygmea, C. B. Adams, Contrib. Conch. 1849, 44. 

 Pisuin adamsi,^ Deshayes, Biv. Brit. Mus. 1854, 284. 

 MuscuUum pijgnieiim, Adams, Rec. Gen. II, 1858, 452. 

 Pisuin pygmeum, 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 pulcliellum, Deshayes.*— P. testa ovata,inflata, 

 tenui, sublsevigata, epidermide viridescente, insequilaterali ; latere antico 

 elongato, rotundato ; latere jiostico brevi, obtuso ; intus albicante. 



Hab. South America, at Maldonardo in Uruguay. 



' Not to be confounded with Pisidium ada7)isi, Prime {Cyclas nitida, 

 Miohels), from Maine. 



2 Not to be confounded with Cyclas pulclitUa, Haxley, or Pisidium pid- 

 chellum, Jenyxs, a variety of P. casertanum, Poll 



