172 AMERICAN JOURNAL 



and partly Chinese groups, while the Paludinse are Indian and 

 native. We give this very short account of M. Schrenck's work 

 with regret that we cannot spare the time and space for an 

 elaborate review. So important and interesting are his state- 

 ments and discoveries to those who are interested in the distri- 

 bution of mollusca, and in illustrating the extent and richness of 

 the North Pacific fauna, that it is to be hoped that a thorough 

 review of his work will be prepared by some American naturalist 

 thoroughly acquainted with our marine mollusca. 



The following species are first described in this work : 



Modiola (Lithophagics) Schmidtii, Solen Krusensternii, 

 Area Broughtoni, Paludina limnceoides. 



Helix Weyrichii. 



