LYMNID/ OF NORTH AMERICA. 339 
Ontario: Mr. Peel’s clay pit near Montreal; found in bed of sand (Bell). 
LACUSTRINE DEPOSITS. 
Intrno1s: In bed of Glacial Lake Chicago (Baker); in beach, Evanston, 
Cook Co. (Marey). 
NepraAsKA: Dakota and Dixon counties (Aughey); Bluff City landing, 
below mouth of Platte River; near mouth of Great Nemaha River, Nemaha Co. 
(Hambach; Swallow). 
Ontario: Owen Sound, Grey District (Geol. Surv. Can.). 
Ecotocy: Found plentifully in creeks, ponds, lakes and rivers, 
in sheltered localities, attached to floating debris, submerged vegetation, 
stones, etc.; also found on decaying fruit, vegetables, etc. In many 
localities reflexa is found in small ponds, ditches, beside roads and 
railroad tracks and in sloughs and other bodies of water which dry 
= 
Geological 
Distribution 
REFLEXA 
@ Loess 
4 Marl beds 
WLacustrine 

up more or less in the summer. In northern Illinois it is more often 
found in these summer-dry ponds than in larger bodies of water. The 
animal is generally rather sluggish in movement, but sometimes moves 
with considerable rapidity, especially when feeding. In Illinois the 
dead shells may be found in summer-dry ponds, scattered over the 
surface after the water has evaporated. In ponds containing cat-tails 
(Typha) this species may be found adhering to the stems of the reeds 
after the water has evaporated. 
