JULY, 1906. 
NOTES ON WISCONSIN MOLLUSCA. 
85 
56. Segmentifia (Planorbula) armigera Say. 
Mud Creek valley at North Milwaukee, abundant ; slough at 
mouth of Mud Creek; Castalia Park, Wauwatosa ; Johnson's 
woods ; marsh in Menomonee valley, opposite Mitchell Park ; dry 
pond at Cabeen's woods, Chicago avenue ; pond near St. Martin's, 
Town Franklin ; Mishicot river, at Two Rivers, Manitowoc Co. 
Kenosha, Mrs. Wiswall's list. "Milwaukee, Wis., I. A. Lapham," 
Smith. Misc. Coll., VII, 138. 
Ancylus (Laevapex) diaphanus Haldeman. 
"Milwaukee, Wis., I. A. Lapham," Smith, Misc. Coll., VII, 
141. 
57. Ancylus (Ferrissia) rivularis Say. 
Root river, at Loomis road, Town Franklin. "Milwaukee, 
Wis., I. A. Lapham," Smith. Misc. Coll., VII., 143. 
58. Ancylus (Ferrissia) parallelus Haldeman. 
Pond near St. Martin's, Town Franklin. The unique speci- 
men obtained was submitted to Mr. Bryant Walker, who cor- 
roborates the identification and writes : "The shell is a good 
example of the compressed, high form of parallelus that occurs 
occasionally. (See Naut., XVIII, p. 77, Plate V, fig. 4-6.) It 
seems to be an individual variation and not a varietal one." 
59. Ancylus sp. 
A single dead shell from an artificial pond near Kraatz's brick- 
yard, west along Vliet street, is considered by Mr. Bryant Walker 
to represent a new species. See Naut., XVIII, 81. 
In all only five specimens of Ancylus were secured, which is 
disappointing, for a much larger number of species should be 
found on industrious search in the proper places. The genus has 
recently been elaborately monographed by Mr. Bryant Walker in 
volumes XVI to XVIII of the Nautilus. 
Physa heterostropha Say. 
Kenosha, Mrs. Wiswall's list. "Milwaukee, Wis., I. A. Lap- 
halm," Smith. Misc. Coll., VII, 89. It may be questioned whether 
these citations appertain properly to this species as now delimited. 
See Baker, Mollusca of the Chicago Area, p. 308, and Nautilus, 
VI, 20 ; XIV, 16; XV, 25. A single immature shell from the 
mill pond at Delafield, Waukesha Co., is doubtfully referred here. 
