AMERICAN SPECIES OP VERTIGO. 79 



ovata has been found with it. Nor can it be referred to 

 ventricosa it is larger and stronger, of much darker color, 

 its surface is not so smooth and polished, it has 3 or even 4 

 lamellae more, and the columella is longer" (Sterki, for var. 

 ovulum) . 



Florida: Volusia Co., type loc., G. W. Webster, Pilsbry 

 and others. Alabama: Stevenson; Tallapoosa R., about 7 

 miles S. E. of Wetumpka. 



[Vertigo rugosula var.] ovulum STERKI, Proc. A. N. S. Phila. 

 1890, p. 35. Not Pupa ovulum Pfr., 1841, also a Vertigo. 

 Vertigo rugosula ovalis Sterki, PILSBRY & VANATTA, Proc. 

 A. N. S. Phila. 1900, p. 608 (substitute for ovulum Sterki). 

 V. r. oralis Sterki, PILSBRY, Nautilus xix, 40 (Cape Sable, 

 Fla.) WHEELER, Naut. xxvi, p. 15 (region of Huntsville, 

 Ala.) VANATTA, Naut. xxvi, 20, 33 (near Marco; Lee Co.; 

 Seminole Pt., Monroe Co., Fla.). 



It is generally stouter in figure than V. rugosula, but the 

 contour varies widely. Some shells are very globose. 

 Length 1.7, diam. 1.1 mm., 4% whorls ) Tallapoosa R. 7 miles 

 Length 2, diam. 1.2 mm., 5 whorls J s. E. of Wetumpka, Ala. 



Length 1.6, diam. 1.1 mm. "I __ , . ~ ., 



I Volusia Co., Fla. 

 Length 1.9, diam. 1.15 mm. j 



The angular lamella is shorter than in V. rugosula, and 

 it is not lower in front. The lip-point is more strongly de- 

 veloped in some specimens from Alabama (fig. 5) than in 

 most of those from Florida (figs. 6, 7) . There is often a notice- 

 able light-colored crest behind the lip. In a specimen from 

 "Mt. Taylor," Volusia Co., the suprapalatal and infrapalatal 

 folds are strongly developed. 



Though this form was at first described as a variety of V. 

 rugosula, Dr. Sterki regards it as nearer to V. ovata, and very 

 close to the European V. antivertigo. The name was pub- 

 lished in 1900 as V. r. ovalis, but this appears to have been an 

 error for oralis, under which name it has appeared in several 

 subsequent lists. 



2. VERTIGO ALABAMENSIS Clapp. PI. 8, figs. 9, 13, 14. 



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



