the river bank, with many HeliceS; that are commonly 

 found in the Western States. They are much the same 

 size, or even a little larger than the Hclicina orbiculata -, 

 Nob. ; which species is destitute of carina and of promi- 

 nent wrinkles or elevated lines, its labrum is rellected. 

 but not thickened, with a distinct angle near its base. 



REFERENCE TO THE PLATF. 



Fl..^. front view; adult, J ErlargecU 



.). front view ; youniy, * 



(t,. natuia! "ize. 

 PI 4(; 



