Baker—The Fauna of The Lake Winnebago Region. 133 
Lasmigona complanata (Barnes). Omro, Fox Eiver. The type locality is 
the Fox Eiver. 
Lasmigona costata (Eaf.). Omro, common and typical. 
ElUptio dilatatus (Eaf.). Omro, not common. 
Elliptio dilatatus delicatus (Simpson). Omro, not common. 
Elliptio dililatus sterTcii Grier. Lakes Winnebago and Butte des Morts, com¬ 
mon. The lake forms are all smaller and seem in every way like the Lake Erie 
forms described by Grier (1918). 
Pleurobema coccineum (Conrad). Omro, not common. 
Quadrula quadrula (Eaf.). Omro, not common. 
Quadrula verrucosa (Eaf.). Omro, not common. 
, Amblema costata (Raf.). Omro, Fox Eiver, Lake Butte des Morts, rare. 
Fusconaia flava (Eaf.). Omro, not common. 
Fusconaia flava parvula Grier. Lake Winnebago, not common. There is 
great variation in the diameter of the shells of this form. 
Sphaeriidae • 
Sphaerium sulcatum Lam. Common in Winnebago and Butte des Morts. 
Sphaerium sulcatum planatum St. Found only in Lake Winnebago. 
Sphaerium lineatum St. In debris on Doemel Point, Lake Winnebago. Only 
one specimen found of this species, which seems rare in the lake. 
Sphaerium striatinum Lam. Lakes Winnebago, Butte des Morts and Fox 
Eiver. The species shows great variation and there may be a variety that 
can ultimately be separated when additional material is available. 
Sphaerium lilycashense Baker. Fox Eiver, rare. 
Sphaerium ohioense St. Lake Winnebago, not common. 
Sphaerium flavum Prime. Lake Butte des Morts, rare. 
Sphaerium solidulum Prime. Lakes Winnebago and Butte des Morts, not 
common. 
Sphaerium stamineum Conrad. Lake Winnebago and Fox Eiver, not com¬ 
mon. 
Sphaerium occidentale amphibium St. Swale in woods on Plummers Point, 
Lake Butte des Morts. Abundant. 
Musculium transversum Say. Lakes Winnebago and Butte des Morts, not 
common. 
Musculium truncatum Linsley. Lake Buttes des Morts, not common. 
Musculium jayense Prime. Lakes Winnebago and Butte des Morts, not 
common. 
Psidium virginicum Gmelin. Lake Butte des Morts, one specimen, juv. 
Pisidium compressum Prime. 
Pisidium compressum pellucidum St. Lakes Winnebago and Butte des Morts, 
common, the variety pellucidum rarer. 
Pisidium fallax St. Lake Winnebago, not common. 
Pisidium punctatum simplex St. Lake Winnebago, rare. 
Pisidium variabile Prime. Lakes'Winnebago and Butte des Morts, common. 
Pisidium pauperculum St. Same as above, not common. 
Pisidium glabellum St. Lake Butte des Morts, very rare. 
