Trachelomonas horrida Palmer 1905, p. 674 

 PI. 84, Fig. 1 

 Test oval, flagellum aperture with a short broad collar; wall uni- 

 formly beset with long, stout, bluntly pointed spines interspersed 

 by short, sharp spines; test 27.5/x in diameter, 35-40)U, long. 

 Uncommon; in several swamps, ponds, and ditches. Wis. 



Trachelomonas intermedia Dangeard 1902, p. 231 

 PL 83, Fig. 10 



Test subspherical to oval, slightly narrowed anteriorly; flagellum 

 aperture with a thickening but without a distinct collar; wall brown, 

 densely punctate; test 16— 18/i, in diameter, 20— 25/i, long. 



Tychoplankter; in ponds and ditches. Wis. 



Trachelomonas Kelloggii ( Skv. ) Deflandre 1926, p. 87 

 PI. 83, Figs. 16, 17 

 Test broadly elliptic to subspherical; flagellum aperture without 

 a collar but occasionally with an annular thickening; wall brown, 

 punctate and roughened with conical granulations which usually 

 are more pronounced around the poles; test (23)-31-34/;i in diam- 

 eter, (27) -35-39^ long. 



Tychoplanktonic and euplanktonic. Wis. 



Trachelomonas laciistris Drezepolski 1925, p. 217 



[T. cylindrica var. punctata Skvortzow] 



PI. 83, Figs. 14, 15; PI. 85, Fig. 15 



Test cylindrical, the lateral margins almost parallel, broadly 



rounded both posteriorly and anteriorly; flagellum aperture usually 



without a collar but sometimes with a slightly raised rim; wall 



coarsely and densely punctate, golden yellow-brown; test 12-16.5/a 



in diameter, 26-29.6/^, long. 



Euplanktonic and tychoplanktonic. Mich., Wis. 



Trachelomonas mammillosa Prescott 1944, p. 370 

 PI. 85, Fig. 12 



Test spherical; flagellum aperture in a mammillate swelling; wall 

 yellowish, smooth but with a thick annular ridge encircling the 

 anterior end; test 24r-26ix in diameter. 



This species is distinguished by the prominent ridge which en- 

 circles the test anteriorly, and the papillate swelling about the 

 flagellum aperture. It should be compared with T. peridiniformis 

 Skv., reported from Manchuria. 



Tychoplankter; in swamps. Wis. 



[415] 



