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THE NATURAL HISTORY SURVEY. 243 
Shell: Small, ventricose, ovate, smooth and shining; 
growth lines fine, oblique; nucleus smooth; color light horn; 
whorls five, well rounded, the last inflated; apex obtusely 
pointed; sutures impressed; aperture semicircular, lateral, 
truncated above, the circumference made up as described 
under V. milium, six to nine dentate, as follows: One to three 
sharp, pointed teeth on the parietal wall, of which the central 
tooth, always the largest, is constant; one, constant, small, 
pointed, placed on the middle of the columella; one, constant, 
at the turn of the peristome, left corner, small, conical; two 
long, narrow teeth, constant, placed on the oblique base and 
outer lip; there is sometimes an eighth tubercle, small, conical, 
rather deep seated, placed between the two teeth on the base, 
Fig. 72. 
VERTIGO OVATA Say, showing variation. (Binney, Fig. 363.) 
and a ninth, very small tubercle placed above the highest tooth 
on the outer lip; peristome a trifle expanded, thin, grooved 
behind, the terminations widely separated and connected by a 
thin callus, whitish or brownish; umbilicus open, deep, some- 
what expanded; the last whorl is peculiarly indented as it ap- 
proaches the aperture (Fig. 72). 
Length, 2.25; diameter, 1.50; aperture length, 0.50 mill. (12327.) 
Animal: With a rather thick, short foot, trilobed in front 
and broadly rounded behind, the two antero-lateral lobes being 
very large and the central lobe small; eye-peduncles rather 
short, thick, club-shaped, swollen at their extremity, which 
bear the black eyes; color generally a cherry-red or blackish, 
fading into bluish or light blackish on the posterior end of the 
