ART. 15 MOLLUSKS OF THE GENUS CORBICULA MARSHALL. 11 



1800. Corbicula rotunda Prime. 



Proc. Acad. Nat. Sci. Phila., p. 80. 



Type locality : Surinam River, Guiana. 

 1S65. Corbicula 'perplexa Prime. 



Smiths. Miscell. Coll. No. 145, p. 75. 



Type locality : South America. 

 1870. Corbicula amazonica (Anthony) Prime. 



Prime in Ann. Lye. Nat. Hist., New York, vol. 9, p. 299. 



Type locality: Amazon River (in stomach of a fish). 

 1879. Corhlcula surinamica Clessin. 



Conch, Cab., vol 9, pt. 3, p. 178, pi. 31, figs. 7-9. 



Type locality: South America (in stomach of a fish, Doras costatus). 

 1896. Corbicula coloniensis Pilsbry. 



Proc. Acad. Nat. Sci., Phila., p. 562, pi. 26, fig. 9. 



Type locality : Rio de la Plata, above Colonia, Uruguay. 

 1914. Corbicula approxinians Preston. 



Ann. and Mag. Nat. Hist., ser. S, vol. 13, p. 528. 



Type locality : Rio Bermejo, a tributary of Rio Chaco, N. Argentina. 

 1914. Corbicula bermejoensis Preston. 



Ann. and Mag. Nat. Hist., ser. 8, vol. 13, p. 528. 



Type locality : Rio Bermejo, a tributary of Rio Chaco, N. Argentina. 



SPECIES HERE DESCRIEEU. 



Corbicula {Cyanocyclas) circularis. Type locality: Uruguay River, Uruguay. 



Corbicula {Cyanocyclas) compacta. Tj'pe locality: Barra del Arroyo Sacra, De- 

 partment of Paysandn, Uruguay. 



Corbicula {Cyanocyclas) delicata. Type locality: Department of Paysandu, 

 Uruguay. 



Corbicula (Cijanociiclas) exquista. Type locality: Department of Colonia, 

 Urnt;uay. 



Corbicxda (Cyanocyclas) felipponei. Type locality: Department of Colonia, 

 Uruguay. 



Corbicula (Cyanocyclas) fortis. Type locality: Department of Colonia, Uru- 

 guay. 



Corbicula (Cyanocyclas) olcana. Type locality: Arroyo de Malvin, Depart- 

 ment of Montevideo, Uruguay. 



Corbicula (Cyanocyclas) paysanduensis. Type locality: Uruguay River, Pay- 

 sandu, Uruguay. 



EXPLANATION OF PLATES. 



All figures XI 1/2- 

 Plate 1. 



Fig. 1. Corbicula (Cyanocyclas) feiipponef, new species. Interior of left valve. 



2. Corbicula (Cyanocyclas) oleana, new species. Exterior of left valve. 



3. Corbicula (Cyanocyclas) oleana, new species. Interior of left valve. 



4. Corbicula (Cyanocyclas) oleana, new species. Dorsal view. 



5. Corbicula (Cyanocyclas) paysanduensis, new species. Interior of left 



valve. 



6. Corbicula (Cyanocyclas) paysanduensifi, new species. Exterior of left 



valve. 



7. Corbicula (Cyanocyclas) felipponei, new species. Dorsal view. 



8. Corbicula (Cyanocyclas) paysanduensis, new\species. Dorsal view. 



