1923} 



CARTER— ALGAE FROM NORTH DAKOTA LAKES 397 



Flagellata 



The plankton of North Twin Lake, near Wing, contained 

 large quantities of an organism which should probably be referred 

 to the genus Euglena, but which, because of poor preservation, 

 could not be determined specifically. 



Algae 



Class MYXOPHYCEAE 



Order COCCOGONEALES 



Fam. Chroococcaceab 



Genus chroococcus Nag. 



Chroococcus dispersus (von Keissler) Lemm. 



Cut-off Pond, Stump Lake; plankton of Lake P; plankton of 

 pond, south of Brush Lake; North Washington Lake; plankton 

 of Lake Isabelle; rare in the plankton of Tokio Lake; plankton 

 of Lake Williams; abundant in the plankton of pond, south- 

 west of Brush Lake. 



Var. minor G. M. Smith in Wis. Geol. & Nat. Hist. Surv. 

 Bull. 57: 28. pi l,f.S. 1920. 

 Plankton of Crooked Lake. 



C. limneticus Lemm. 



Rare in the plankton of Carpenter Lake, near shore; more 

 abundant in the deeper water of the same lake; plankton of 

 Willow Lake; rare in the plankton of Brush Lake; abundant in 

 the plankton of Florence Lake; plankton of Buffalo Lake; plank- 

 ton of Long Lake, near Ruso; plankton of Lake X; plankton of 

 South Free Peoples Lake; plankton of Carpenter Lake; North 

 Free Peoples Lake. 



C. turgidus (Kiitz.) Nag. 



Cut-off Pond, south end of Stump Lake; Alkaline Lake, II; 

 North Free Peoples Lake; Lake P; Court Lake; slough below 

 Wheeler's Pond; Main Lake. 



Genus gloeocapsa Kiitz. 



Gloeocapsa fenestralis Kiitz. 



Also recorded by Snow (1902) from the plankton of Lake Erie. 

 Eastgate's Pond. 



