AMNICOLA. 55 



lieve the young of other species have been 

 mistaken for it, and I think it probable that 

 the habitat is quite restricted. I have ex- 

 amined Amnicolae bearing this specific name 

 from various localities, but invariably found 

 them to be — something else. 



B. Species of the Pacific States. 



8. AMNICOLA LONGINQUA, Gould. 

 Plate 17, fig. 5. 



'' Shell small, elongate-ovate, smooth ; apex 

 obtuse ; whorls five, rounded ; suture deep ; 

 aperture elliptical, rounded posteriorly; colu- 

 mella very arcuate, subperforate." 



Alt. 3, diam. 2-5 mill. 



Colorado Desert, Cal. 



Resembles Cincinnatiensis in general aspect, 

 but the outline of the spire is more convex and 

 the aperture is more appressed to the body. 



(36) 



