Trachelomonas superha var, spinosa Prescott 1944, p. 370 



PI. 84, Fig. 5 



Test broadly oval; wall spiny, with the posterior part beset with 

 much longer and more sharply pointed spines; flagellum aperture 

 without a collar but encircled with a coronula of sharp, erect spines; 

 test 32.5-36/A in diameter, 39-48/x long. 



This variety differs from the typical form in its greater size, the 

 longer spines at the posterior pole, and the coronula about the 

 flagellum aperture. 



Euplankter and tychoplankter. Wis. 



Trachelomonas superha var. Swirenkiana Deflandre 1926, p. 84 

 PI. 83, Fig. 34; PI. 84, Figs. 8, 9 



Test subglobose; flagellum aperture in a low, ring-like collar; 

 wall spiny in the anterior and posterior portions with a few minute 

 spines in the midregion; the posterior spines longer and stouter 

 than in the anterior region; test 31ju. in diameter, 40/x long. 



Euplankter and tychoplankter. Wis. 



Trachelomonas sydneyensis Playfair 1916, p. 22 

 PI. 84, Fig. 2 



Test elongate-ellipsoid, broadly rounded both anteriorly and 

 posteriorly; flagellum aperture in a short collar with a spiny margin; 

 wall brown, rather evenly beset with short, sharp spines in the 

 posterior and anterior regions but with only sharp granules in the 

 midregion; test 25)u, in diameter, 32-40ju, long. 



Tychoplankter; in swamps. Wis. 



Trachelomonas triangularis Deflandre 1924, p. 1128 



PI. 83, Fig. 6 



Test subtriangular, broadly convex posteriorly, lateral walls sharp- 

 ly convex from the broad base, converging to a truncate apex; 

 flagellum aperture occupying the entire diameter of the apex; wall 

 lignt brown; test 12-14/i, in diameter, \4-lQfx long. 



In swampy habitats and in roadside ditches. Wis. 



Trachelomonas varians (Lemm.) Deflandre 1924, p. 1124 



PI. 83, Figs. 4, 5 



Test globose or subglobose; flagellum aperture surrounded by a 

 low flat ring from which a cylindrical canal extends inwardly to 



[418] 



