80 AMERICAN SPECIES OF VERTIGO. 



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 con- 

 stricted opposite the upper palatal, simple above the con- 

 striction, and with a strong callus or internal collar running 

 down and connecting with the columella. Denticles 7, the 

 parietal high, sinuous and deeply entering; angular strong, 

 flat; upper palatal 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. 1.10 mm. ; length of aperture 0.69, width 0.63 mm. 

 (Clapp). 5% whorls. 



Alabama : among rotting leaves in a ravine near junction of 

 North River with Black Warrior, Tuscaloosa Co., H. H. Smith. 



Vertigo alabamensis CLAPP, Nautilus xxviii, April, 1915, 

 p. 137, pi. 6, f. 6, 6a, 6fe. 



This is a peculiar species. The parietal lamella is very 

 strongly developed, high and long. The angular lamella is 

 far longer than usual in Vertigo, and converges inwardly 

 towards the parietal. The columellar lamella descends near 

 its outer end, and penetrates deeply. _The "subcolumellar" 

 descends obliquely inward, its crest either emarginate or level 

 (pi. 8, fig. 9). It is apparently to be considered a basal fold, 

 since the palatal callus extends to it. If this interpretation 

 is correct, the tooth described as the basal must be an infra- 

 palatal fold. It is usually a very low tubercle, and very 

 rarely "distinct," as described and figured by Dr. Clapp. 

 The palatal folds are very strongly developed, the upper a 

 high lamina, the lower rising to a peak deep within. 



The types of this and the following form are in coll. G. H. 

 Clapp ; figured from paratypes in coll. A. N. S. P. 



2a. Vertigo alabamensis conecuhensis n. subsp. PL 8, fig. 12. 



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

 which differs from the type in being shorter and more globose 



