10 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol. 6G 



remote from beaks, very short, its middle point high and moderately 

 sharp. Pallial line well marked, the sinus quite large for a shell of 

 this size. 



The type, Cat. No. 270895, U.S.N.M., measures : length, 13 mm. ; 

 height, 11.5 mm.; diameter, 7 mm. It comes from the Uruguay 

 River, Paysandu, Uruguay, and was collected and presented by Dr. 

 Florentino Felippone. In form this species approaches C. cxquisita^ 

 but differs in color and especially in possessing the strong concentric 

 ridges near the beaks and on the anterior area. 



SPECIES OF CORBICULA (CTANOCYCLAS) CHRONOLOGICALLY ARRANGED AND WITH ORIGINAL 



GENERIC DESIGNATIONS. 



1809. Tellina limosa Maton. 



Trans. Linn. Soc. London, vol. 10, p. 325, pi. 24, figs. 8-10. 



Type locality : Rivers of South America. 

 1835. Cyrena variegata Orbigny. 



Mag. de Zool., vol. 5, p. 44. 



Type locality: Rivers of Uruguay, La Plata River at Bneiios Aires, 

 Parana River as far as Corrientes. 



A synonym of limosa Maton. 

 1835. Cyrena paranacensis Orbigny. 



Mag. de Zool., vol. 5, p. 44. 



Type locality : Parana River from its mouth to above Corrientes. 

 1844. Cyrena cuneata Jonas. 



Zeit. filr Malak., p. 186. 



Type locality : Orinoco River. 

 1844. Cyrena globulus Jonas (in litt.). 



Zeit. fiir Malak., p. 186. (Not described. Here Jonas states that it is 

 the same as C. cuneata .Jonas.) 

 1840. Cifclas paranensis Orbigny. 



Voy. Amer. Merid., p. 56, pi. S3, figs. 25-27. 



A correction for Cyrena paranacensis Orbigny. 

 1854. Corbicula hrasUiana Deshayes. 



Bivalves Brit. Mus., p. 232. 



Type locality : Para, Brazil. 



Deshayes refers to Proc. Zool. Soc. London, p. 232, 1854. as place of 

 original description. No such description occurs there. 

 1854. Corbicula convexa Deshayes. 



Proc. Zool. Soc. London, vol. 22, p. 342. 



Type locality : Central America. 

 1854. Corbicula incrassata Deshayes. 



Proc. Zool. Soc. London, vol. 22, p. 342. 



Type locality : Unknown. 



Prime places it in the synonymy of Corbicula cuneata Jonas. 

 1854. Corbicula obsoleta Deshayes. 



Proc. Zool. Soc. London, vol. 22, p. 343. 



Type locality : Uruguay. 

 1854. Corbicula semisulcata Deshayes. 



Proc. Zool. Soc. London, vol. 22, p. 343. 



Type locality : Victoria River, Australia. 



Locality evidently an error. Prime and Clessin place this in the 

 synonymy of Corbicula limosa Maton. 



