AMERICAN SPECIES OF VERTIGO. 109 



(fig. 13). The species was mentioned in lists by Dr. Sterki 

 as early as 1892, but it was described from no. 68881 A. N. 

 S. P., in 1900. 



I have hesitated whether to rank V. columbiana as a western 

 race of T 7 . ventricosa, but as I have seen only one or two from 

 each of the localities, it is left distinct temporarily. There 

 is no "auricle" or incurved point of the outer lip, such as 

 most specimens of ventricosa show, and none of the examples 

 seen shows a basal tooth; yet in ventricosa this is sometimes 

 lacking. If columbiana is not a race of V. ventricosa, it is 

 certainly very near akin. PL 9, fig. 12 represents the type 

 specimen, no. 68881 A. N. S. P. I have not seen the St. Paul 

 Island specimens. 



V. columbiana, utahen-sis Sterki (Nautilus vi, p. 5, name 

 only ; Pils. & Van., P. A. N. S. 1900, 603, pi. 23, fig. 10 ; Pils. 

 & Ferr. 1910, p. 144) is identical, I believe, with V. colo- 

 radensis, and has no direct relationship with V. columbiana. 

 The type, no. 109009 A. N. S. P., is figured, pi. 12, fig. 12. 



19. VERTIGO ANDRUSIANA Pils. PL 11, figs. 9, 10, 11. 



The shell is rimate, imperforate, cylindric-oblong, with con- 

 vexly conic, obtuse summit; cinnamon-brown, becoming paler 

 upwards, the initial whorl gray; somewhat glossy, without 

 noticeable striation, most minutely granulose. The whorls 

 are moderately convex, the last having a rather low but distinct 

 crest followed by a wide, shallow contraction behind the lip ; 

 an impressed line over the upper palatal fold terminates at 

 the lip, which is slightly bent in at this point. The aperture 

 has (four to) six teeth : a short, high parietal lamella, a small, 

 tubercular angular lamella (sometimes very inconspicuous), 

 a stout, short, columellar lamella which ascends a little in- 

 wardly, a small, tubercular basal fold (sometimes wanting) 

 and two well developed palatal folds, the lower being longer. 

 The palatal folds stand upon a thin, light-colored callus. The 

 outer lip is scarcely expanded, the basal slightly so, the colu- 

 mellar margin dilated. 



Length 2.46, diam. 1.3 mm.; 5y 2 whorls (type, fig. 10). 



Length 2.35, diam. 1.3 mm.; 5y 3 whorls. 



Length 2.3, diam. 1.3 mm. 



