Trachelomonas scabra var, longicollis Playfair 1916, p. 28 



PL 85, Fig.7 

 Test ovoid; flagellum aperture in a short, twisted collar; wall 

 irregularly and rather coarsely roughened; test 19.5/x in diameter, 

 27.3/. long. 



Tychoplankter. Wis. 



Trachelomonas similis Stokes 1890, p. 76 

 PI. 84, Fig. 12; PI. 85, Figs. 10, 13 



Test oblong-ellipsoid; flagellum aperture in a curved collar; wall 

 uniformly roughened by irregularly shaped granulations; test 

 ( 13.4)-14-19(a in diameter, 39-41/x long. 



Tychoplankter. Wis. 



Trachelomonas speciosa Deflandre 1926, p. 122 

 PI. 84, Fig. 13 



Test ovate-fusiform, abruptly narrowed posteriorly into a short 

 or long caudus which is trifurcated at the apex to form 3 stout 

 spines; narrowed anteriorly to form a short neck with 3-4 teeth 

 around the margin of the flagellum aperture; wall uniformly beset 

 with moderately long, slender spines; test 20-25jli in diameter, 

 51-56/x long. 



Tychoplanktonic and euplanktonic. Wis. 



Trachelomonas spectabilis Deflandre 1926, p. 86 

 PL 85, Fig. 19 



Test oval, elongate; flagellum aperture without a collar but 

 with a crenulate margin; wall minutely punctate, with irregularly 

 scattered, stout, long spines; test 31.2— 44/. in diameter, 50—65/. 

 long. 



Plankter; in both lakes and swamps. Wis. 



Trachelomonas superba ( Swir. ) Deflandre 1926, p. 84 



PL 84, Fig. 10 

 Test broadly oval; flagellum aperture without a collar but often 

 with a circle of stout spines at the rim; wall uniformly beset witli 

 short, sharp spines; test 23-25/. in diameter, 31-46.8/. long. 

 Tychoplankter; in swamps. Wis. 



Trachelomonas superba var. duplex Deflandre 1926, p. 85 



PL 84, Fig. 11 

 Test broadly oval, furnished with spines distinctly longer in the 

 polar regions; test 28-30/. in diameter, 35-40/. long. 

 Tychoplankter; in swamps. Wis. 



[417] 



