242 THE CHICAGO ACADEMY OF SCIENCES. 
Length, 1.40; diameter, 0.90; aperture long, 0.30 mill. (11997.) 
Sy Laas aS 0.80; > « 0.25 “ (11997.) 
Animal: Similar in form to the other species of Vertigo; 
color dirty white, darker on the upper surface; foot very broad, 
posterior of the center, from whence it tapers rapidly to a 
point; the foot is thick and fleshy and well able to support the 
light shell; eye-peduncles of medium length, somewhat en- 
larged at the tips, where the eyes are placed. 
Jaw: Very slightly arcuate, the ends a trifle rounded; 
concave margin notched and anterior surface lightly striated. 
The jaw is of equal width throughout its length (Fig. 71). 
Fig. 71. 
Jaw of VERTIGO MILIUM Gould. (Original.) 
Radula formula: 32!7+4+}3+4+3!, (11—1I—11); teeth as 
inthe other members of the genus, and resembling closely those 
of B. contracta but somewhat wider. There are four perfect 
laterals and the first marginal similar but with a second outer 
cusp; from this point the marginals become wider, the inner 
cusp remains always the larger, and the outer cusp develops 
from five to seven small cusps or denticles. 
Genitaia: Unknown. 
Distribution: Maine to Minnesota, Ontario and Quebec, 
Canada, to Florida and Texas. ( Pilsbry.) 
Geological distribution: Pleistocene; Loess. 
Hatitat: Gregarious. Found plentifully under leaves, 
stones and sticks, in moist situations. 
Remarks: This is the smallest of our Pupe and is a very 
beautiful species, the peculiar gular lamina, dark chestnut 
color and globose-fusiform shape serving to distinguish it ata 
glance. There are sometimes several small accessory tubercles 
developed, but these do not affect its general specific charac- 
ter. It is confined, so far as known, to the northern and west- 
ern regions. , 
Suscenus VERTIGO Drap. ( Typical.) 
97. Vertigo ovata Say, pl. xxx, fig. 13. 
Vertigo ovata SAY, Journ. Phil, Acad., Vol. II, p. 375, 1822. 
Pupa modesta Say, Long’s Exped., Vol. II, p. os, pl. xv, fig. 5, 1824. 
Pupa ovulum PFEIFFER, Olim. Symbolz, Vol. I, p. 46. 
Zonites upsoni CALKINS, Valley Nat., Vol. II, No. 4, p. 53, fig. 1880. 
