190 THE CHICAGO ACADEMY OF SCIENCES. 
Bay; French River; Lake Nipissing; Lake Temagami and Lake Temiskaming, 
Nipissing Dist.; “doubtless occurs in suitable waters from Albany River to 
Lake Abittibi’ (Latchford) ; Cobalt Lake, Nipissing Dist. (Latchford). 
Quesec: Nun’s Island, near Montreal, Hochelaga Dist. (Whiteaves) ; 
McGoey’s Lake, in the Laurentides, near Chelsea (Trans. Ottawa Nat. Field 
Club). 
GEOLOGICAL RANGE: Leda clay, ten miles below Ottawa City, On- 
tario (Bell). 
Ecorocy: In rivers, lakes, sloughs and ponds. “A small lily 
pond in the bed of the Mississippi River just below St. Cloud. The 
snails are to be seen floating on the surface or feeding upon the lily 
leaves. They are shy, sinking almost instantly when alarmed” (Sar- 
gent). ‘The animal is sluggish in its habits and excessively timid, the 
slightest disturbance of the water causing it to instantly draw itself into 
the shell. Though it feeds upon alge in confinement my specimens 
also devour the animals of land snails and of fresh-water mussels with 
great greediness” (Wetherby). “Common in ponds and_ pools” 
(Keyes). ‘‘Not uncommon on floating masses of vegetation in some of 
the ponds and lakes in the northern part of the state” (of Iowa) 
(Shimek). “The waters of Lake Cobalt, Ontario, Canada, are so im- 
pregnated with arsenic as to cause serious intestinal trouble to those 
who use it. L. megasoma, however, lives and thrives, attaining large 
size and preserving to a ripe old age the beautiful epidermis character- 
istic of young shells” (Latchford). 
At Tomahawk Lake, Wisconsin, megasoma lives in swampy por- 
tions of sheltered bays where the water is quiet. The bottom of such 
a habitat is boggy and the water is so shallow that frequently little 
boggy islands are formed, and on these megasoma may be found, one 
or two specimens on each island. In other parts of this habitat they 
may be found near the shore, clinging to logs and other debris. A 
small, swampy slough, lying between the Wisconsin River and Gil- 
more Creek, Oneida County, afforded the best habitat for megasoma, 
where they lived in considerable number. This slough is about a quar- 
ter of a mile long and two or three hundred feet wide; the water is (in 
summer) but a few inches in depth, but the mud, which is about the 
consistency of mush, is from six to ten feet in depth. Megasoma lives 
on the surface of the mud and on old logs which the lumbermen have 
left in the swamp. It would seem that the characteristic habitat of 
megasoma 1s a swamp or marshy pond or bay (Baker). 
A single large, but dead, specimen was found in a pond-like bayou 
which was connected with Tobin Harbor by a very narrow and short 
outlet (Walker, Isle Royale). 
