BIOLOGICAL RECONNOISSANCE AT FLATHEAD LAKE. 173 



Limnaea caperata Say; Wibaux, 



Limnaea stagnalis L., var. appressa Say; Bitter Root River, Swaa 

 Lake, 



Limnaea nuttalMana Lea; Missoula, 



Limnaea emargjnata Say, var. montana EIrod; 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 umbilicatelius Cockrell (P, umbilicatus Taylor); Wibaux, 



Planorbis trivoivis L.; Daphnia Pond, Flathead Lake, Sinyaleamin 

 Lake, Swan Lake. 



Family ANCYLIDAE. 



Ancylus rivuiaria Say; one specimen from AVibaux. 

 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 ampuliacea 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. 



Valionia cyclophoreila Ancey, Washington to Montana. 



Polygyra devia mullani (Bid. and Coop.), near Coeur d'Alene Mis- 

 sion, Coeur d'Alene Mountains, Idaho; west side of Bitter Root Mount- 

 ains, Washington, 



Polygyrella polygyrella (Bid. 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. 



