126 THE CHICAGO ACADEMY OF SCIENCES. 
Prostate long, narrowly cylindrical, with slightly bulbous ter- 
mination; penis thick, about half as long as penis-sac; lateral teeth 
tricuspid; shell succineiform, axis slightly gyrate. 
Genus PseuposuccINEA Baker. 
Prostate short, pear-shaped when viewed laterally; penis very | 
slender, longer than penis-sac; first lateral tooth tricuspid, balance 
bicuspid; shell with depressed spire and large body whorl, the axis 
gyrate. 
Genus Raprx Montfort. 
Prostate very large, irregularly elongate-ovate; penis very large, 
one-fourth longer than penis-sac, gradually enlarging in diameter 
toward the distal end; lateral teeth tricuspid; shell large, bulimiform, 
highly colored, axis twisted, with a sharp fold. 
Genus BuLIMNEA Haldeman. 
Prostate large, flatly cylindrical; penis thick, about four-sevenths 
the length of penis-sac; lateral teeth bicuspid; the mesocone with a 
distinct entoconic swelling; shell very slender, the apical whorls much 
longer than wide, the whorls very flat-sided; axis gyrate. 
Genus AceLLA Haldeman. 
Prostate very large, long-ovate or elongate-pyriform ; penis shorter 
than penis-sac, usually very thick. 
Genus GALBA Schrank. 
a. Prostate long-ovate; penis a trifle shorter than penis-sac, 
of narrow diameter; lateral teeth bicuspid; shell small, usually 
without spiral sculpture and with a flat, expanded inner lip, 
without a fold on the columella, the axis being hour-glass shaped. 
Subgenus GaLBa Schrank. 
b. Genitalia as in (a); lateral teeth tricuspid; shell usually 
small, without strong spiral sculpture; axis as in (a); inner lip 
not typically expanded as in (a). 
Subgenus Srmpsonra Baker. 
c. Prostate elongate-pyriform; penis from three-fourths to 
four-fifths the length of penis-sac, very thick; lateral teeth bicus- 
pid; shell large, with marked spiral sculpture, the columella 
strongly plicate. 
Subgenus STAGNICOLA Swainson, 
d. Shell elongated with cylindrical whorls; details of animal 
not recorded. 
Subgenus LeEpToLIMN2A Swainson. 
