ANCYLUS. 



221 



Subfamily ANGYLINM 



Genus ANCYLUS, Geoffro?/. 



The number of known species has been 

 nearly doubled since the publication of Prof. 

 Haldeman's Monograph, the additions being 

 principally from the States of Oregon and 

 California. The shells are generally small, 

 and not readily detected. 



A. Species occurring in the States east of 

 THE Rocky Mountains. 



1. ANCYLUS OBSCURUS, Haldeman. 

 Haldeman, Monog. p. 5, t. 1, fig. 5. 



I have heard of no other locality than the 

 original one. That the species occurring in 

 the West India islands is the same as this I 

 think doubtful, although Adams and Shuttle- 

 worth believe it to be the same. 

 (15) 



