310 THE CHICAGO ACADEMY OF SCIENCES. 
Only a single lot of sheils has been found which could be | 
referred to this species, and that was collected in the drift 
along the shores of Lake Michigan, at Miller’s, Ind. The 
nearest of typical keterostropha have been found living in Pine 
Lake, La Porte County, Ind. It is very probable that this spe- 
cies is not found in any abundance west of Indiana, its place 
being taken by gyrina, sayii and integra. Under distribution, 
above, only those states are given from which the writer has 
seen authentic specimens. 
126. Physa sayii Tappan, pl. xxxiv, fig. 3, 7; pl. xxxii, fig. 13. 
Physa sayit TAPPAN, Amer. Journ. Sci. (i), Vol. XXXV, p. 269, pl. ili, 
fig. 3, 1889. 
Physa warreniana LEA, Proc. Phil. Acad. Sci., p. 115, 1864. 
Shell: Sinistral, polished, ovate, whorls five to five and 
one-half; spire elevated, very acute, the whorls moderately 
convex; color light horn to light chestnut; sculpture consist- 
ing of rather coarse growth lines, crossed by numerous fine, 
impressed spjral lines, giving the surface of the shell a wavy 
appearance, as figured for P. gyrina; sutures slightly impressed, 
bordered as in heterostropha,; protoconch consisting of one and 
one-half smooth, glossy whorls of a dark chestnut color; aper- 
ture very large, long-oval, three-fourths to four-fifths the length 
of the whole shell; peristome thin, generally not very much 
thickened within, whitish, sometimes bordered with reddish; 
columella slightly twisted and covered with a spreading callus; 
the lower part of the aperture is somewhat produced. 
Length, 22.00; width, 13.50; aperture length, 16.00; width, 7.50 mill. 
sh TOO0 8 es Fae Os se HE. CPALAEDO FREE SOU ee 
mi 16.005° 70%" =< 11,00: ef a6 a0 pe Dee 
Animal; Similar in external appearance to all Physide. 
Faw and Radula: As in gyrina. 
Genitaha: Not observed. 
Distribution: Northern United States and Southern Canada 
west to the Rocky Mountains and south to the Ohio and Mis- 
souri Rivers. 
Geological distribution: Pleistocene; Loess. 
Habitat: In stations similar to heterostropha and gyrina. 
Remarks: This species was at first identified as P. ancal- 
laria Say, but that species, while having the same surface sculp- 
ture as sayz, is more inflated, the outer lip more spreading and 
the body whorl more gibbous, the spire being a/ways much 
shorter and the whorls more convex. The surface,sculpture is 
