256 College of Forestry 
was an empty shell. The species is widely distributed, oceur- 
ring in Traverse Bay, Saginaw Bay, and Tomalae Lake, 
in the latter place in a rapidly flowing creek on a sandy 
bottom. It is listed by Beauchamp. 
10. Strophitus undulatus (Say). Fig. 42, No. 
This species was collected on a bouldery exposed point. 
It is apparently rare. Some authors consider this species 
and the last (edentulus) as representing variations of the 
same species (Ortmann, 1912, p. 299) and this may be true. 
However, ecologically, the two forms found in Oneida Lake 
are different in color, shape and habitat, the latter being 
rayed while the former is black and ri alee and is more 
inflated. Undulatus is confined to the St. Lawrence and 
Atlantic drainage systems. It is listed by Beauchamp. 
Genus Lampsiuis Rafinesque. 
11. Lampsilis luteola (Lam). Fig. 48, Nos. 1, 2. 
This mussel inhabits six stations, all exposed points or 
shores. It is abundant at one station, common at one, and 
rare at the other four. Several gravid females were noted, 
which agreed in all details with Ortmann’s description 
(1912, p. 348). This mussel is widely distributed, 
being found in ‘Traverse Bay, Saginaw Bay, Georgian Bay, 
Isle Royale, and Tomahawk Lake. They live either on 
exposed shores or in protected bays. Listed by Beauchamp 
under the names luteola and siliquoides, the latter a 
synonym. It is eaten by the muskrat. 
12. Lampsilis radiata (Gmelin). Fig. 42, No. 5; Fig. 43, 
Nos. 3, 4. 
Collected from thirteen stations, all exposed, on a sandy or 
bouldery bottom, the mussel living between the stones. Next 
to Elliptio complanatus the most abundant mussel in the 
lake. It is common in the streams flowing into the Atlan- 
tic Ocean and the St. Lawrence River and is also said to 
inhabit Manitoba (Simpson, 1914, p. 65). Radiata often 
