LYMN^EID^E OF NORTH AMERICA. 



339 



Ontario: Mr. Peel's clay pit near Montreal; found in bed of sand (Bell). 



LACUSTRINE DEPOSITS. 



Illinois: In bed of Glacial Lake Chicago (Baker); in beach, Evanston, 

 Cook Co. (Marcy). 



Nebraska : 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.). 



Ecology : 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 rcflcxa is found in small ponds, ditches, beside roads and 

 railroad tracks and in sloughs and other bodies of water which dry 



f^JT 



Fig. 38. 



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 

 (Typh'a) this species may be found adhering to the stems of the reeds 

 after the water has evaporated. 



