96 VERTIGO. 



Vertigo wheeleri Pilsbry. PL 15, fig. 1. 



The shell is rather obesely oval, the diameter about two- 

 thirds of the length, cinnamon colored. The first 11/2 whorls 

 are pale and smooth; the rest are closely and finely striate, 

 the striation rather strong, about as in V. coloradensis ; it is 

 somewhat coarser on the penult than on the last whorl. The 

 whorls are strongly convex, the last near the outer lip becom- 

 ing a litlte flattened peripherally, and having a weak, wide 

 swelling or crest behind the outer and basal lips. The rather 

 small aperture is broadly pear-shaped, obstructed by five 

 teeth : the angular lamella is tuberculiform, the parietal 

 lamella higher and rather long; columellar lamella hori- 

 zontally entering, but rather short; the two palatal folds are 

 short. The lip is slightly expanded, the outer margin notice- 

 ably straightened in the middle, and in a profile view seen to 

 be weakly arched forward there. 



Length 1.6, diam. 1.05 mm. ; 4i/^ whorls. 



Alabama: Monte Sano, near Huntsville, collected by H. E. 

 Wlieeler. 



Vertigo wheeleri Pilsbry, in Walker's Terrestrial Shell- 

 bearing Mollusca of Alabama, Univ. Michigan Misc. Pub. No. 

 18, 1928, p. 146, fig. 224. — Vertigo concinnula Wheeler, 

 Nautilus XXV, 1912, p. 124, c/. Pilsbry, Man. Conch. XXV, 

 p. 121. 



This species has the broad, ventricose figure of V. hehardi 

 Van., but is a larger, less fragile and more strongly striate 

 shell, the columellar lamella differing in form. It is decidedly 

 more ventricose than V. goiddii which, with five teeth as in 

 wheeleri, has generally a second columellar and but one tooth 

 on the parietal wall; however these two teeth are variable in 

 V. goiddii; the main distinction is in the shape of the shell. 

 These two species appear to be the nearest relatives of the new 

 form. V. rugosula and oralis have much more strongly de- 

 veloped teeth and an outer lip of different shape. 



Specimens presumably those now under consideration were 

 shown me by Mr. H. E. Wheeler many years ago and were 

 identified as V. concinnula Ckll., a Rocky Mountain species 



