92 



THE LIFE OB^ DEVILS LAKE 



disappearing again in October ; altho I have a single record for 

 November 4, 1909, and one from a towing on June 24, 1914. This 

 was a female with three nearly developed young in her brood pouch. 

 Moina was also numerous in Minnewaukan Bay on July 20, 1916. 

 It forms a relatively small part of the plancton, tho occurring at 

 times in dense swarms in the warm water close to shore.** Gen- 

 erally distributed throughout the lake with the exception of the 

 ooze, where however the ephippia occur in winter. Reported also 

 for Stump, East, Lamoreau and Mission Lakes. In Lake A an 

 indeterminate Moina has been reported which is probably this 

 species. 



r^^^P^ 



Figure 25. Seasonal distribution of Moina in Main Lake. 



Daphnia })iar/mi. Eeported from ]\Iinnewaukan Bay in 1916, 

 probably due to the fresh water supply which the latter received 

 in that year. It occurs also in Spring Lake and fresh waters. 



Daphnia psittaeea. Occurs infrequently in widely separated 

 lakes. One record each from Main, Stump and Spring Lakes. 



Daphnia longispina varf This species has been found occasional- 

 ly in Main Lake, but the variety has not been determined. 



Daphnia pidex? An immature specimen was taken in Main 

 Lake (10/2/17). It occurs also in fresh waters in the vicinity. 



Daphnia sp. Daphnia occurs in Lamoreau Lake and Lake 0, 

 but the species are indeterminate, as only ephippia have been found. 

 One male, sp. ?, has also been reported for East Lake (1917). 



Ceriodaph'nia pulchella, l^i-ynocephalu^ vetulus, Alona rectan- 

 (jttla. Chijdurus sphaericits. There is one record only for each of 

 the above species — Main Lake, 10/2/17. The last species, however, 

 has been taken in neighboring fresh waters. 



Bosniina longirostris. One record from Lamoreau Lak(\ and 

 one from a fresh water lake in the neighborhood. 



**As many as 70,000 p<n- 1. See Moliprg (191S). 



