BIOLOGICAL RECONNOISSANCE AT FLATHEAD LAKE. 171 
Anodonta ovata Lea; young, Wibaux. 
Genus Margaritana. 
Margaritana margaritifera Lea; Bitter Root River, Tributaries of 
Pend d’Oreille River. 
Class GASTROPODA. 
Subclass Euthyneura. 
Order Pulmonata. 
Suborder Stylommatophora. 
(Superfamily Holopoda.) 
Family HELICIDAE. 
Subfamily Helicinae (vel Belogona.) 
Genus Vallonia, Risso, 1826, 
Vallonia gracilicosta Reinh.; Wibaux. 
Vallonia gracilicosta Reinh., var. close to costata Say; Wibaux. 
Vallonia perspectiva Sterki; Wibaux. 
Vallonia pulchella Mull.; Wibaux. 
Subfamily Ploygyrinae (vel Protogna.) 
Genus Polygrya Say, 1818. 
Polygyra albolabris Say. A single specimen, which I refer to this 
species, was sent from Lewistown by P. M. Silloway, while the proof was 
being read. 
Polygyra devia, var. hempnilli W. G. B.; Missoula. 
Polygyra townsendiana, var. ptycophora A. D. Br.; Flathead Indian 
Reservation, in Mission Valley and Mission Mountains. 
Family PUPIDAE. 
Genus Pupa Draparnand. 
Pupa muscorum L.; Wibaux. 
Pupa blandi Morse; Wibaux. 
Pupa blandi Morse, var. edentata; one specimen, Wibaux. 
Pupa syngenes Pilsbry; eight more or less perfect specimens, Wi- 
baux. 
Pupa holzingeri Sterki; Wibaux. 
Pupa armifera Say; Wibaux. 
Pupa pentodon Say; Wibaux. 
Pupa decora Gld; Wibaux. 
Genus Vertigo Draparnand. 
Vertigo ovata Say; Wiraux. 
Vertigo binneyana Sterki; Wibaux. 
(Superfamily AULACAPODA Pilsbry.) 
Family ZONITIDAE. 
Subfamily Zonitinae Pilsbry. 
Genus Vitrea Fitzinger. 
Vitrea arborea Say; worn var., approaching V. breweri Newc. Wibaux. 
Vitrea radiatula Alder; rare. Wibaux. 
