Trachelomonas hispida (Perty) Stein 1883, PI. 22, Figs. 21, 24-^3 



PI. 83, Fig. 35 



Test ovate, narrowed anteriorly; flagellum aperture slightly raised; 

 wall uniformly beset with minute, sharp-pointed warts; test 24-26/i, 

 in diameter, 29-31;u, long. 



This species and T. volvocina are the most commonly found 

 members of the genus in our region. 



Generally distributed in a variety of ponds, swamps, and ditches; 

 in tow samples from lakes. Mich., Wis. 



Trachelomonas hispida var. coronata Lemmermann 

 ex Deflandre 1926, p. 79 



PI. 83, Fig. 30 



Test oblong-oval; flagellum aperture surrounded by a short collar 

 with the margin bearing a circle of spines; wall uniformly beset 

 with short spines; test 20 fx, in diameter, 29-32/a long. 



In shallow water of ponds and ditches. Wis. 



Tachelomonas hispida var. crenulatocollis 

 fa. recta Deflandre 1926, p. 78 



PI. 83, Fig. 31 



Test ovoid; flagellum aperture in a short collar with a coarsely 

 toothed margin; wall punctate and unevenly beset with short sharp 

 spines; test 25-26ju, in diameter, 33-34/x long. 



Euplanktonic and tychoplanktonic. Wis. 



Trachelomonas hispida var. papillata Skvortzow 1925, p. 36 



PI. 84, Fig. 7 



Test oval; flagellum aperture without a collar or thickening; wall 

 brov^oi or pink-brown, smooth except for a few minute spines about 

 the flagellum aperture; 28-30/* in diameter, 34-40/a long. 



Euplankter; with the typical form. Wis, 



Trachelomonas hispida var. punctata Lemmermann 1906, p. 165 



PI. 84, Figs. 3, 4 



Test broadly oval; flagellum aperture without a distinct collar 

 but with a slightly raised rim; wall coarsely and densely punctate; 

 test 29/A in diameter, 32-34/i, long. 



Tychoplanktonic and euplanktonic. Wis. 



[414] 



