JULY, 1906. 
NOTES ON WISCONSIN MOLLUSCA. 
83 
near Layton Park; doubtfully from Lake Winnebago, west of 
High Cliff. "Milwaukee, Wis., I. A. Lapham," Smith. Misc. Coll., 
VII, 67. Everywhere scarce. 
50. Limnaea (Limnophysa) desidiosa Say. 
Mud Creek and its valley at and east of North Milwaukee ; 
artificial pond near Kraatz's brickyard, Vliet street; Menomonee 
river, near old Falk brewery and in slough above Castalia Park ; 
Honey Creek, near Layton Park (L. parva in part, fide F. C. 
Baker) ; Lake Winnebago, west of High Cliff; Mishicot river, at 
Two Rivers, Manitowoc Co. 12659, Cold Spring avenue, fossil. 
"Milw." in pencil, Smith. Misc. Coll., VII, 48, public library copy. 
A considerable portion of the above were referred to the 
preceding species by Mr. Baker on a hasty examination, but in 
this I cannot follow him. 
Limnaea (Acella) gracilis Jay. 
"Has been quoted from Wisconsin," Smith. Misc. Coll., 
VII, 69. 
51. Planorbis (Helisoma) trivolvis Say. 
Lake Michigan beach at North Point pumping station ; stream 
near electric light plant, Wauwatosa ; Menomonee river dredg- 
ings ; Kinnickinnic river, near Eleventh avenue ; lily-pond in 
South Park ; mill pond at Delafield ; Okauchee, and Ballad's 
cottage, Okauchee Lake, Waukesha Co. ; north shore of Lake 
Winnebago, Calumet Co. ; East Twin river, at Two Rivers, Mani- 
towoc Co. Kenosha, Mrs. Wiswall's list. "Madison, Wis., Prof. 
S. F. Baird; Milwaukee, Wis., I. A. Lapham," Smith. Misc. Coll., 
VII, 121. 
51a. Planorbis trivolvis Say, large form. 
Molas Creek, Manitowoc Co. 3946, Sheboygan, C. M. 
Wheatlev collection, as P. " corpulentus." This seems to be the 
form which has frequently been confounded with Planorbis corpu- 
lentus Say, a western species. See the Nautilus, XIII, 133 ; 
XIV, 33. 
52. Planorbis (Helisoma) bicarinatus Say. 
Menomonee river dredgings ; Menomonee valley, near Castalia 
Park ; stream near electric light plant, Wauwatosa ; Honey 
Creek, near Layton Park ; Kinnickinnic river, near Eleventh 
