COLUMELLA. 245 



uals may be recognized by the more cylindric shape of the 

 spire and the striation, but occasionally their discrimination 

 is difficult. Some of the Colorado records given above may 

 possibly pertain to C. edentula. 



Whether C. alticola is really distinguishable from C. colu- 

 mella appears to me doubtful, but the whorls are noticeably 

 more convex and the striation a trifle more distinct than in 

 the German loess columella compared. Larger series of colu- 

 mella, including recent specimens, are requisite for a definite 

 decision. The form from Port Clarence, Alaska, referred to 

 columella by Westerlund, is unknown to me. Hanna has sug- 

 gested that some Unalaskan Columella? belong to a new 

 species with the following measurements: Length 2.84, diam. 

 1.6 mm. 



9. Columella hasta (Hanna). PI. 30, fig. 18. 



Shell more than 5 mm. in height, long and cylindrical. 

 Light brown in color and glossy. Spire greatly elevated but 

 obtusely pointed on the apex. "Whorls 8% to 9, rather flat- 

 tened on the face and the last subangulated around the 

 periphery. The last six whorls are of about equal diameter; 

 the first three increase rapidly. Lines of growth faint and 

 oblique; apex smooth and white. Aperture somewhat angu- 

 lated at the base of the columella. Peristome thin and acute, 

 forming a regular curve without an indentation in the upper 

 palatal region such as is present in most of the Vertigos. 

 The aperture is very slightly thickened with callus on the in- 

 side of the peristome in the basal region. Peristome not re- 

 flected and with no callus crest back of the aperture. Teeth 

 and lamella? entirely absent from the aperture. Umbilicus 

 with a very small perforation. 



Length, 5.81 mm.; diameter, 2.03 mm. (Hanna). 



Kansas: Pleistocene of Long Island, Phillips County (G. D. 

 Hanna, Edw. C. Johnston). 



Sphyradium hasta Hanna, Proc. U. S. Nat. Mus., vol. 41, 

 Oct. 14, 1911, p. 372, text-fig. 1. 



"This species differs from all others by its much greater 



