426 THE CHICAGO ACADEMY OF SCIENCES. 
many specimens have, in addition to the spiral impressed lines, a num- 
ber of heavy, more or less equidistant spiral ridges encircling the body 
whorl; the last whorl may also be somewhat malleated; whorls 5 to 
514, globose, roundly shouldered, inflated, the body whorl very globose 
and disproportionately swollen; spire varying from broadly acute to 
depressed, usually about half the length of the entire shell; suture 
well marked, often deeply impressed; aperture roundly-ovate, rarely 
quadrate, seldom flaring; peristome with internal, varical thickening ; 
inner lip wide, whitish, broadly reflected over the umbilical region 
producing a wide, flat expansion, which emarginates the umbilical 
chink, as in the typical form; umbilical chink usually very large and 
conspicuous ; imperforate individuals are rare; the parietal callus is 
thick and wide producing a continuous aperture in some specimens ; 
the lower part of the aperture is somewhat effuse in a few individuals. 
Length. Breadth. Aperturelength. Breadth. 
23.50 15.00 13.00 7.50 mill. 
22.00 15.00 12.00 S:00n" 
24.00 16.00 13.50 9.00 ~ 
24.00 16.25 13.00 8.00 
26.50 19.50 16.50 tO0 
25.00 19.00 16.00 10:00 os 
26.00 19.00 16.50 NOLOON teas 
Types: The Chicago Academy of Sciences, 19 specimens, No. 
24504; cotypes, coll. Bryant Walker, Detroit, Mich.; Academy of 
Natural Sciences, Philadelphia. 
Tyre Locatity: East shore Tomahawk Lake, Oneida Co., Wis. 
AnIMAL: Similar to typical emarginata. The animals of the 
Tomahawk Lake race are of two very pronounced colors, black with 
white dots and bright yellow with white dots. This difference in the 
animal is quite conspicuous rendering the light colored specimens less 
noticeable than the dark colored individuals against the white sand 
of the shore. 
Jaw, Raputa and Geniraxra: In all respects similar to those of 
emarginata. 
Rance: (Figure 46). Wisconsin. 
Wisconsinensis has been only seen from the type locality. It 
doubtless lives in many lakes in Northern Wisconsin, and has probably 
been identified as mighelsi. 
RECORDS.* 
Wisconsin: Tomahawk Lake, Oneida Co. (Baker). 
iThe statement in the Nautilus vol, XXIV, p. 28, in which certain speci- 
mens from Brome Lake are referred to this race is erroneous. A series re- 
cently received from Mr. Latchford shows them to be referable to mighelsi. 
