Feb., 1920] The Protozoa of Mirror Lake 107 



Euglena oxyuris Schmarda. 



This organism was common in the same two months old 

 culture that contained the Euglena granulata. The forms were 

 considerably smaller than those described by Lemmermann 

 (1913). 



Length 192-200^; breadth 24-26^. 



Euglena torta Stokes. 



One individual was taken in December on alga-covered 

 poplar roots (Station D). 



Length 64ju. 



Euglena viridis Ehrenberg. 



This form was common in November in algae from Station 

 H, in December among alga-covered poplar roots (Station D), 

 and on March 1, among sediment and algae on the stone near 

 the outlet of the larger pond (Station K). 



Length 56-61/i. 



» 



Trachelomonas intermedia Dangeard. 



This species was infrequent among filaments of dead 

 Oedogonium from Station H taken in the early part of March. 

 It moved very swiftly and was bright red in color. 



Length 24^; diameter 18/i. 



Trachelomonas volvocina Ehrenberg. 



Early in December this form w^as common among floating 

 Spirogyra (Station C). The organism was almost spherical. 

 Length 2(V. 



Phacus alata Klebs. 



This form was common in a culture of algae taken on 

 December 3 from Station G, which had been standing two 

 months. 



Length 19/i; width, the same. 



Phacus longicauda Ehrenberg. 



This species was infrequent in collections but was taken 

 regularly throughout October, November and December, in 

 floating algae from Station C, in sediment from Station F, and 

 in material scraped from a submerged stone at Station G. 



Length SO/x; width 32/x. 



