Africa. 



51. CORBICULA AFRICANA, Deshayes. 



Ann. N. Y. Lyceum VIII. 

 Cape Natal, South Africa, 

 a. Umpingano river, South Africa. 



52. CORBICULA ASTARTINA, Martens. 



Malak. Bl. 1859, 

 Lake Nyassa. 



53. CORBICULA IN^EQUILATERALIS, Prime. 



Ann. N. Y. Lyceum VIII. 

 Africa. 



Asiatic Turkey and Egypt. 



54. CORBICULA PUSILLA, Deshayes. 



Philippi Abbild. 

 The Nile. (Ex Collection of Parreys, the original describer.) 



