M'Clelland. Read Feb. 17, 1841, to the Boston Society 

 of Natural History ; by D. Humphreys Storer, M. D., 92 

 XI, Des Moulins' General Considerations on Restricting the 

 number of Species of the genera Unio and Anodonta ; 

 translated from the French, by Philip H. Nicklin, A. M., 104 



