252 



LAND ANT) FRESH-WATER SHELLS OF N. A. [PART 1. 



Vertigo milium, W. G. Bixkey, Terr. Moll, IV, 148. — Mokse, Amer. Nat. 

 I, 669, f. 65, 6G (1868). 



From New EndaDcl to Texas. 



Vertigo OTata, Say. — Shell minute, ovate-conic, veutiicose, dark 

 amber-colored ; whirls five, very convex, the last much inflated, diminish- 

 ing rather rapidly to a somewhat acute apex, with an indentation towards 

 the aperture ; suture rather deep ; peristome thin, somewhat expanded, 

 with a groove behind and a thickening within ; aperture in general outline 

 semicircular, the curve consisting of segments of two different sized, but 



Fi-. 442. 



Fig. 413. 



Vertir/o ovata. 



well defined circles, the smaller on the right at the junction of the peri- 

 stome and body-whirl, comprising about one-fourth of the whole contour, 

 and forming an angle at their junction; teeth generally six, two on the 

 transverse margin, two on the columellar margin, the upper of which is 

 massive, the lower pointed, and two on the peristome, in the base and at 

 the junction of the two curves, sharp and prominent ; umbilicus expanded. 

 Length 3, diam. IJ mill. ; aperture 1 long. 



Vertigo ovata, Say, Journ. Acad. Nat. Sci. Philad. II, 375 (1822) ; ed. 

 BiHNEY, 26.— BiNNEY, Terr. Moll. II, 334, pi. Ixxi, f. 4.— W. G. Bix- 

 NEY,Terr. Moll. IV, 148.— Morse, Amer. Nat. I, 668, f. 57, 58 (1868). 



Pupa ovata, Godld, Bost. Journ. Nat. Hist. IV, 350, pi. xvi, f. 7, 8 

 (1843).— DeKay, N. Y. Moll. 50, pi. iv, f. 50 (1843).— Adams, Ver- 

 mont MoUusca, 157 (1842) ; Silliman's Journal, [i]. XL, 271.— 

 KiJsTER, in Chemnitz, ed. 2, IIP, pi. xiv, f. 1, 2; xv, f. 35, 38.— 

 Pfeiffer, Mon. Hel, Viv. II, 360 ; Symbols, II, 54. 



Pupa modesta, Say, Long's Exped. 11, 25, pi. xv, f. 5 (1824) ; ed. Binney, 

 32, pi. ixxiv, f. 5.— Gould, Invertebrata, 188, f. 119 (1841). 



