4 University of Michigan 



ered in a short time made it impossible to collect intensively 

 in many interesting places. The number of species listed from 

 Upsilon and Gravel Lakes, however, promises well for future 

 records of other lakes in this locality. 



The specific localities in which collections were made may 

 be described briefly as follows: 



The Devils Lake Region 



Devils Lake : The shores near the Biological Station are 

 wooded with oak, elm, aspen and other trees, and the same 

 vegetation prevails on the south shore near SuUys Hill, where, 

 however, a moister ground and denser undergrowth prevail. 

 Dead shells of water snails were taken from the shore below 

 Sullys Hill as well as from the vicinity of the Station, but 

 these were either very old and chalky, or had been washed in 

 from some coulee in time of high water. 



Court Lake : A fresh pond which was at one time a part 

 of Devils Lake. Rushes and reeds line the shores, and the 

 bottom is gravelly. Around the lake, woods of the usual sort 

 formed a habitat for the small land snails. 



Fort Totten Lake : A small fresh pond south of Devils 

 Lake, with Sullys Hill and outlying hills for its water-shed. 

 Reeds and rushes almost surround it, and it is nearly filled 

 with a luxuriant growth of chara and elodea. 



r.ig Mission Lake: Once a part of Devils Lake, and now a 

 characteristic alkaline pond. Old shells in considerable num- 

 bers occur on old beach lines, and probably indicate to some 

 extent the character of the fauna once inhabiting Devils Lake. 



Mauvaise Coulee: Contained a sluggish stream, with hard- 

 ly perceptible current. It probably emptied a small quantity 

 of water into Devils Lake during the summer of 1919. though 

 the outlet into the lake was so choked with deposits of muck 

 and silt that it seemed evident that there had been little active 



