BIOLOGICAL RECONNOISSANCE AT FLATHEAD LAKE. 173 
Limnaea caperata Say; Wibaux. 
Limnaea stagnalis L., var. appressa Say; Bitter Root River, Swan 
Lake. 
Limnaea nuttalliana Lea; Missoula. 
Limnaea emarginata Say, var. montana Elrod; Sinyaleamin Lake and 
McDonald Lake in the Mission Mountains, Swan Lake. 
Genus Planorbis. 
Planorbis bicarinatus Say; Wibaux. 
Planorbis lentus? Say; young shells only, Wibaux. 
Planorbis parvus Say; Wibaux, Flathead Lake. 
Planorbis umbilicatellus Cockrell (P. umbilicatus Taylor); Wibaux. 
Planorbis trivolvis L.; Daphnia Pond, Flathead Lake, Sinyaleamin 
Lake, Swan Lake. 
Family ANCYLIDAE. 
Ancylus rivularia Say; one specimen from Wibaux. 
Family PHYSIDAE. 
Genus Physa. 
Physa gyrina Say; young only, Wibaux, Missoula. 
Physa ancillaria Say; Wibaux. 
Physa heterostropha Say; Wibaux, Missoula. 
Physa lordi Baird; Wibaux. 
Physa ampullacea Gld., lakes in the Mission Mountains, Flathead 
Lake, Swan Lake. 
Genus Aplexa. 
Aplexa hypnorum; ponds along the Missoula River near Missoula. 
The five species following are referred to in Pilsbry and Johnson’s 
Catalogue of the Land Shells of America as probably occurring in Mon- 
tana. The notes accompanying are quoted from the catalogue. The 
addition of these to the preceding list makes the total number of species 
and varieties in the state 65. 
Vallonia costata montana Sterki, Rocky Mountains. 
Vallonia cyclophorella Ancey, Washington to Montana. 
Polygyra devia mullani (Bld. and Coop.), near Coeur d’Alene Mis- 
sion, Coeur d’Alene Mountains, Idaho; west side of Bitter Root Mount- 
ains, Wiashington. 
Polygyrella polygyrella (Bld. and Coop.), Coeur d’Alene Mountains, 
Idha. <A variety montanensis Ancey is described from Deer Lodge Val- 
ley, Montana. 
Succinea retusa Lea. Canada to Montana, southward to Georgia. 
