Trachelomonas Playfairii Deflandre 1926, p. 110 



PI. 85, Figs. 8, 9 



Test broadly ellipsoid or ovate and rounded both anteriorly and 



posteriorly; flagellum aperture in a short curved collar; wall smooth, 



almost colorless or light yellow; test 19-21- ( 23 )/«, in diameter, 



23-30/^ long. 



Tychoplanktonic and euplanktonic. Wis. 



Trachelomonas pulchella Drezepolski 1925, p. 221 

 PI. 83, Fig. 28 

 Test oval to ovoid, small; flagellum aperture with a short ring-like 

 collar; wall uniformly beset with blunt, wart-like roughenings; test 

 (5)-11.7-17/A in diameter, about 15/a long. 

 Tychoplankter. Wis. 



Trachelomonas pulcherrima Playfair 1916, p. 13 

 PL 83, Figs. 22, 23 



Test elliptic or subcylindric-elliptic; flagellum aperture without 

 a collar; wall yellow-brown, smooth; test 14.8ju, in diameter, 22ju, long. 

 Euplankter. Wis. 



Trachelomonas pulcherrima var. minor Playfair 1916, p. 14 



PI. 83, Figs. 24, 25 



Test oval or elliptic; flagellum opening without a collar; wall 

 brown, smooth; test 7.5/* in diameter, 12.5/x long. 



A variety similar to the typical except for the smaller size. 



Trachelomonas rohusta Swirenko 1914, p. 636 

 PI. 83, Fig. 29 

 Test subglobose or oval; flagellum aperture without a collar but 

 with a thickened rim; wall dark brown, evenly beset with short, 

 sharp spines; test 14-16/x in diameter, 20-25/x long. 

 Tychoplankter. Wis. 



Trachelomonas rotunda Swirenko 1914, p. 636 

 PI. 83, Fig. 9 



Test subspherical or spherical; flagellum aperture without a collar; 

 wall coarsely and densely punctate; test 26^0/x in diameter, 33.5/x 

 long. 



Tychoplankter. Wis. 



[416] 



