THE LIFE OF J)EVll7S LAKE 73 



Goitipkunciiia is rei>resentcd l»y Ihrce species, graeile, moiitamim 

 and parvulum, of which tlie two latter are the commonest, graeile 

 being reported only twice, 8/21/13 and 8/28/13, both from Main 

 Lake. Gomphonema appears but rarely in the plancton samples, 

 hence no attempt has been made to determine its seasonal distri- 

 bution. 



Ehoicosphenia curvata is common in Main Lake, tho not often 

 taken in the plancton collections. Reported also from Lamoreau 

 Lake. 



Amphiprora alata. Taken occasionally in the plancton collec- 

 tions from Main Lake, and reported once from Lamoreau Lake. 



Coeconeis. Two species of Cocconeis, pedicnlus and placen- 

 tula, are common and widely distributed in the complex and in 

 neighboring- fresh waters. 



AchnantJies is represented in the complex by three species, 

 delicatula, lanceolata and microcephala, none of which are common, 

 and there is a doubtful record of a fourth, hungarica. 



Hoinoeocladki is represented in the complex by eight species, 

 augustata, amphioxys, eommutata, hungarica, lanceolata, palea, try- 

 blionella and vermicularis, with one uncertain record (Main Lake, 

 8/28/13) of another species, stagnorum. Of these hungarica is the 

 most common, followed, in the order named, by palea and am- 

 phioxys. 



C amp ylodi sens clypeus is fairly common in Main Lake, tho 

 of infrequent occurrence in the plancton samples. Reported also 

 from Mission and Spring Lakes and Lakes A and P. 



Surirella occurs frequently in the plancton catches, appearing 

 about the first of April and disappearing about the middle of 

 November, somewdiat earlier than most of the algae. The irregu- 

 larity of its occurrence renders it ditificult to draw any conclusions 

 relative to its seasonal distribution. Of the two species in Devils 

 Lake, striatula and ovalis ovata, the former is the more common. 



Denticula elegans. A rare species, reported only from Main 

 Lake. 



Fragilaria construois. Reported in one collection 8/19/20 from 

 Lake P. 



OdoiitidiiDH elongaium. Reported from Main Lake only. A 

 fairly common species, but too irregular in the plancton collec- 

 tions to w^arrant any conclusions regarding its seasonal distribu- 

 tion. 



Synedra. Four species of Synedra occur in the complex, 

 pulchella, tabulata, tenuissima and ulna, with a doubtful record 

 (Main Lake 8/28/13) of a fifth, amphicephala. Of these pulchella 

 is common, while the others occur rather rarely. No attempt has 

 been made to differentiate the several species in the plancton 



