THE NAUTILUS. 137 



DESCRIPTION OF A NEW SPECIES OF VERTIGO, WITH 

 NOTES ON OTHER FORMS. 



BY GEO. H. CLAPP. 



VERTIGO ALABAMENSIS n. sp. Plate vi, figs. 6, 6a, 66. 



The shell is cylindric-oval, perforate, convex, sutures well 

 impressed, the last whorl somewhat tapering below, bulging 

 above, and deeply constricted over the palatal folds ; crest well 

 marked. Lip well reflected, pale brown, and deeply constricted 

 opposite the upper palatal, simple above the constriction, and 

 with a strong callous or internal collar running down and con- 

 necting with the columella. Denticles 7, the parietal high, 

 sinuous and deeply entering ; angular strong, flat ; upper pal- 

 atal deep, very high in front and tapering to the rear, lower 

 palatal very deeply seated, inner end back of the subcolumellar 

 lamella, both palatals distinctly showing from the outside as 

 white lines. Columellar lamella strong flat ; subcolumellar 

 bifid, strong ; basal fold distinct, set on the callous collar just 

 below the subcolumellar lamella. 



Length 1.8, diam. 1.0 mm. Length of aperture 0.69, width 

 0.63 mm. 



"Among rotting leaves in a ravine near junction of North 

 River with Black Warrior, Tuscaloosa Co., Ala." (H. H. 

 Smith 1909). 



VERTIGO ALABAMENSIS CONECUHENSIS n. subsp. Plate, vi, figs. 

 7, 7a. 



At Evergreen, Conecuh Co., Ala., Mr. Smith found a variety 

 (No. 9158) which differs from the type in being shorter and 

 more globose with the teeth less strongly developed and the 

 basal fold absent in all shells examined. Length 1.53, diam. 

 1.0 mm. Length of aperture 0.58, width .63 mm. 



The types of these are in my collection ; paratypes in coll. 

 A. N. S. Phila. 



VERTIGO OSCARIANA Sterki, variety. Plate vi, fig. 8. 



This rare species was taken at Evergreen, Conecuh Co., Ala- 

 bama. The specimens are more transparent than the types, 

 and a little less strongly striate, but they agree in the characters 

 of the aperture. 



