Africa. 
51... CORBICULA AFRICANA, Deshayes. 
AnnNS VE yceum VII 
Cape Natal, South Africa. 
a... Umpingano river, South Africa. 
52... CORBICULA ASTARTINA, Martens. 
Malak. Bl. 18509, 
Lake Nyassa. 
53... CORBICULA INÆQUILATERALIS, 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.) 
