Trachelomonas armata fa. inevoluta Deflandre 1926, p. 88 



PI. 83, Fig. 33 

 Test broadly ovate; wall smooth; collar a low, flat ring; test 29.6- 

 30)Li in diameter, 36.5-38|ii long. 

 From swamps. Wis. 



Trachelomonas armata var. longispina 

 (Playf.) Deflandre 1926, p. 88 

 PL 83, Fig. 27 

 Test broadly obovate; flagellum aperture without a collar, but 

 with a circle of erect spines at the margin; anterior region with short 

 spines, posterior portion with stout spines; both short and long; 

 test 30-31/A in diameter, 41-48/a long. 

 Plankter; in lakes. Wis. 



Trachelomonas armata var. Steinii Lemmermann 1906, p. 165 



PI. 83, Fig. 26 

 A variety differing from the typical by having more numerous 

 spines anteriorly and spines stouter posteriorly. 

 Plankter; with the typical form. Wis. 



Trachelomonas bulla (Stein) Deflandre 1926, p. 110 



PI. 84, Fig. 15 

 Test ovoid, narrowed rather gradually anteriorly to form a broad 

 collar; wall with minute spines, punctate; a flange at the base 

 of the neck and projecting inwardly to form a pore which is 

 narrower than the outer opening of the collar; test 23— 24;u, in 

 diameter, 39fi long. 

 In a Sphagnum bog. Wis. 



Trachelomonas charkowiensis Swirenko ex Deflandre 1926, p. 85 



PI. 85, Fig. 14 



Test oval; flagellum aperture with a short collar; wall brown, 

 uniformly beset with stout conical spines; test 20/i, in diameter, 

 32.5/A long. 



Tychoplankter; in swamps. Wis. 



Trachelomonas crehea (Kellicott) Deflandre 1926, p. 103 



Test symmetrically ellipsoid, irregularly punctate and sometimes 

 roughened; flagellum aperture in a short, wide collar which is either 

 straight or shghtly expanded at the outer rim; shell yellowish- or 

 reddish-brown, 19;li in diameter, 19-25/x long. 



Typical form not reported from our region. Wis. 



[411] 



