in the form of small numerous rods; cells 5Sfi in diameter, 55-60/i, 

 long. 



In tychoplankton; among mats of Spirogyra. Wis. 



Euglena gracilis Klebs 1883, p. 303 

 PI. 85, Fig. 17 

 Cells metabolic, short-fusiform to ovoid; chloroplasts many, disc- 

 shaped bodies evenly distributed throughout the cell, with pyre- 

 noids; paramylon bodies not observed; cell 8-15-(22);ii in diameter, 

 37-50/x long. 



In Sphagnum bogs and in ponds where there is a high concentra- 

 tion of nitrogenous matter; usually found with other species of 

 Euglena. Wis. 



Euglena minuta Prescott 1944, p. 365 

 P1.85, Figs. 23, 24 



Cells highly metabolic, fusiform to somewhat pyriform, produced 

 posteriorly into a short, blunt, often curved tip; membrane smooth 

 ( ? ) ; flagellum % the length of the cell; 1 plate-like chloroplast with 

 a pyrenoid; paramylon bodies many small rods (?); cells 5-6/i, in 

 diameter, 12-14^11 long. 



In tychoplankton; Muskellunge Lake, Wisconsin. 



Euglena oxyuris Schmarda var. minor Prescott 1944, p. 366 



PI. 85, Fig. 18 



Cells slightly metabolic, mostly keeping a constant shape in 

 movement; elongate-cylindric and twisted; tapering posteriorly 

 rather abruptly to form a short tail-piece. Periplast longitudinally 

 striated; chloroplasts numerous, disc-like; paramylon grains 2 large, 

 flattened rings, one anterior and one posterior to the central nucleus. 

 Cells 15-18/i, in diameter, 77-85^^ long. 



This variety differs from the typical in its smaller size, the typical 

 being twice as large ( 30-45|a in diameter, 375-500/x long ) . 



In shallow water of High Lake, Wisconsin. 



Euglena polymorpha Dangeard 1902, p. 175 

 PI. 85, Figs. 21, 22 

 Cells metabolic, ovoid-pyriform to subcylindric, narrowed grad- 

 ually posteriorly to a short, blunt tip; periplast with spiral striations; 

 chloroplasts many and disc-like with laciniate margins, with 1 pyre- 

 noid; paramylon bodies small ovoid grains (not observed in our 

 specimens); cells 20-26/a in diameter, 80-90/li long. 

 In roadside ditches. Wis. 



[393] 



