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162 THE CHICAGO ACADEMY OF SCIENCES. 
very deeply impressed; whorls five to six, rounded, regularly 
increasing in size, the last ventricose; spire depressed, convex; 
aperture broadly lunate, slightly contracted by the peristome; 
peristome thin, reflected, not much expanded; the upper por- 
tion near the body whorl is not expanded, but is a direct con- 
tinuation of the last whorl, separated by a constriction; the 
peristome is sometimes grooved; terminations widely sepa- 
rated, connected by a thin callus; umbilicus closed by the re- 
flection of the peristome near the columella, the region indented; 
base of shell flatly convex. 
Greater diameter, 25.00; lesser, 21.00; height, 15.00 mill. (7714.) 
= + 21.00; Fe 08 7:00 613.0005 8TH 
Animal: Similar in form to profunda ; color blackish all over, 
but the protuberances are lighter colored: the foot is very 
long and narrow, and the eye-peduncles long and tapering. 
Heart pulsations twenty-seven to thirty-four per minute; four 
specimens examined gave 27, 28, 31, 34 per minute. Theanimal 
is very slow and rather timid. 
Jaw: As usual, slightly arcuated, with ten ribs of good size 
which denticulate both margins; the ends are almost square. 
The jaw resembles that of Polygyra pennsylvanica. 
Radula formula: 33,+ 37 +4+ 3% +25 (42—1-—42); the 
teeth resemble those of Folygyra profunda, excepting that all 
after the twenty-fourth tooth and all beyond have the inner 
cutting point bifid. Some membranes have the formula 
v4,+3f+4+15+4 (40—1—40), there being but sixteen per- 
fect laterals. One apparently perfect membrane had 130 rows 
of teeth. 
Genitalia: ‘‘Penissac long, stout, with a very highly devel- 
oped prepuce on the greater part of its course, then tapering 
to its summit, where it receives the vas deferens and retractor 
muscle; genital bladder long, subcylindrical, its duct but 
slightly smaller, short, swollen at its entrance into the vagina; 
oviduct greatly convoluted.” (W.G. Binney.) 
Distribution: Western New York to Minnesota and Iowa, 
south to Kentucky, Kansas and Virginia. 
Geological distribution: Pleistocene; Loess. 
. Habitat: Marshy woodlands and meadows in the vicinity 
of streams. 
Remarks: This species may usually be distinguished by 
its imperforate shell and numerous spiral color-bands. The 
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