AMERICAN SPECIES OP VERTIGO. 115 



shorter palatal folds, as well as the somewhat shorter, wider 

 shape, separate this species from V. binneyana, which is other- 

 wise similar. It does not agree in detail with any of the 

 forms of V. coloradensis, though closely related to them. The 

 striation is of irregularly, rather widely spaced wrinkles, as 

 strong as in V. coloradensis but decidedly less regular and 

 less crowded than on the penult whorl of that species. The 

 outer lip is not at all expanded, rather blunt. The parietal 

 lamella is rather long, as in V. coloradensis. 



The figure is from the type, one of no. 226396 U. S. N. M. 

 As the name had been used by Sayn for a Pleistocene species 

 of France, that of Mr. Hanna has been substituted. 



22. VERTIGO COLORADENSIS (Cockerell). PL 12, fig. 13. 



"Shell brown, shiny, thinnish, translucent enough to show 

 teeth through (body whorl) from outside, striate, especially on 

 penultimate whorl. Outline oblong-oval, barrel-shaped, apex 

 blunt. Whorls four. Aperture pyriform. Peristome brown, 

 thick, continuous by a well-marked callus on parietal wall. 

 Outer lip not constricted; a crest is indicated behind peris- 

 tome, but not well developed. The teeth within the aperture 

 are brown, one long one on parietal wall, one on columellar, 

 and two, the lower one largest, on outer wall. Length 1%, 

 diam. 1 mm. (Ckll.). 



Length 1.75, diam. 1 mm. 



Colorado: near Swift Creek, Custer Co., Cockerell, type loc. 



FIG. 1. VERTIGO COLORADENSIS CKLL. 



Utah : Box Elder canyon at 4500 ft., H. Hemphill. Arizona : 

 Pine Canyon, at 7500 ft., and head of Cave Creek canyon. 



