Trachelomonas euchlora ( Ehrenb. ) Lemmermann 1906, p. 165 



PL 89, Fig. 21 



Test cylindrical with subparallel sides, broadly truncate both 

 posteriorly and anteriorly; wall smooth, brown; flagellum aperture 

 usually oblique in a neck; test 18-20/u, in diameter, 25-30/1, long. 



In swamps and ponds. Wis. 



Trachelomonas Girardiana (Playf. ) Deflandre 1926, p. 126 



PI. 84, Fig. 14 



Test subhexagonal with emarginate lateral walls, narrowed 

 abruptly posteriorly into a long, stout caudus, anteriorly tapering 

 abruptly into a long or short neck; wall brown, roughened; test 

 21-26ya in diameter, 38-45- ( 57 )/x long. 



In swamps. Wis. 



Trachelomonas granulosa Playf air 1916, p. 18 

 PI. 89, Fig. 17 



Test broadly ellipsoidal; flagellum opening usually furnished with 

 an exterior thickening; wall brown, densely granular; test 19/i, in 

 diameter, 21/a long. 



Plankter; in sloughs and ponds. Wis. 



Trachelomonas hexangulata Swirenko 1914, p. 646 

 PI. 85, Figs. 5, 6, 11 



Test hexagonal-cylindric, the lateral walls nearly parallel, nar- 

 rowed with slightly concave margins posteriorly, and rounded at 

 the base; anteriorly narrowed and extended into a long neck with 

 an annular thickening internally at the opening into the neck; wall 

 smooth, brown; test 14-16/x. in diameter, 30-36/1, long, 3.8/a wide at 

 the posterior pole, 3.6/x wide at the aperture. 



Plankter; in swamps and ponds. Wis. 



Trachelomonas hexangulata var. repanda Prescott 1944, p. 370 



PI. 84, Fig. 16 



Differing from the typical by having the lateral margins of the 

 test more convex and the posterior lateral margins more concave 

 so that a blunt apiculation is produced posteriorly; test 14.4— 15/a in 

 diameter, 36-38/* long. 



Tychoplankter. Wis. 



[413] 



