132 Wisconsin Academy of Sciences, Arts, and Letters. 
LIST OF MOLLUSCA 
Unionidae 
Dysnomia triquetra Eaf. A single small individual was dredged from the 
Fox Eiver at Omro. This is the first record for Wisconsin, and the northern¬ 
most record for any locality. It occurs in southern Michigan. 
Lampsilis ventricosa (Barnes). Common in the Fox Eiver at Omro and 
other places. 
Lampsilis ventricosa canadensis (Lea). Lakes Winnebago and Butte des 
Morts, abundant. Not before reported from Wisconsin. 
Lampsilis siliquoidea (Barnes). Common in the Fox Eiver at Omro and 
other places. 
Lampsilis siliqudidea rosacea (DeKay). Lakes Butte des Morts and Winne¬ 
bago, abundant. First authentic records from Wisconsin. 
Ligumia recta (Lamarck). Lake Winnebago, common. The typical form 
from Lake Erie seems to be represented in the lake, where the individuals 
are smaller and more brightly colored and rayed than the large, black speci¬ 
mens from the rivers. 
Ligumia recta latissima (Eaf.). Fox Eiver at Omro and other places. The 
large river form. Abundant. 
Proptera alata (Say). Common in Lake Butte des Morts and Lake Win¬ 
nebago. As noted by Ortmann (1920) and others the Lake Erie form of alata 
is smaller and more swollen than the river forms and the epidermis is usually 
browner. The Winnebago Lake shells are of this form. 
Proptera alata megaptera (Eaf.). Fox Eiver and other places, common. 
A much larger shell with more compressed valves. 
Leptodea fragilis (Raf.). Omro and other places on the Fox Eiver, 
abundant. 
Leptodea fragilis lacustris (Baker). Lakes Winnebago and Butte des Morts, 
common. The lake shells differ markedly from the river shells in color and 
form. (Baker, 1922, p. 131.) 
Truncilla trunoata (Eaf.). Omro, Fox Eiver, common. Lake Butte des 
Morts, rare. 
Truncilla truncata (Eaf.) variety. A form of truncata occurs in Lake 
Winnebago which is somewhat smaller than the river type of this species. 
The umbones are less elevated, the valves are rounder and more compressed and 
the posterior ridge is much less developed. Not enough material is at hand 
to differentiate this from the typical species. 
Actinonaias carinata (Barnes). Omro, Fox Eiver, common; Lake Butte 
des Morts, rare. 
Strophitus rugosus (Swainson). Omro, Fox Eiver, rare. 
Strophitus rugosus (Swainson). Var. Lakes Winnebago and Butte des Morts, 
not common. 
Anodonta imljecillis Say. Omro, Fox River, common. 
Anodonta grandis gigantea Lea. Omro, Fox Eiver, common. 
Anodonta grandis footiana Lea. Lakes Winnebago and Butte des Morts, 
abundant. This is the type locality for footiana. 
