33. Wall spiny 34 



33. Wall punctate or scrobiculate; test oval to subcyUndric, 



15.6 X 27.3m T. abrupta 



34. Test with prominent, long, blunt spines, 31— 44/a in 



diameter T. spectabilis 



34. Test with sharp spines; flagellum opening with a 



ring of spines; 23— 25u in diameter T. superha 



Trachelomonas abrupta ( Swir. ) Deflandre 1926, p. 93 

 PI. 83, Figs. 18, 19 



Test oval to subcylindric, truncate at the anterior end; flagellum 

 aperture very wide; wall coarsely punctate, light tan in color; test 

 15.6/A in diameter, 27.3/a long. 



In swamps. Wis. 



Trachelomonas acanthostoma ( Stokes ) Deflandre 1926, p. 60 

 PI. 83, Fig. 13; PI. 85, Fig. 3 



Test subglobose or ovoid; wall densely punctate, sometimes with 

 minute spiny projections about the flagellum aperture which has a 

 low collar; test 21.4/i, in diameter, S2Afx long. 



In shallow water of lakes and in ponds. Wis. 



Trachelomonas aculeata fa. brevispinosa Prescott 

 in Prescott, Silva, & Wade 1949, p. 89 



PL 85, Fig. 4 



Test spherical; flagellum aperture in a short neck; wall furnished 

 with 5 spines, which are stouter and much less produced than in 

 the typical form, which has 5 very long and finely tapering spines; 

 cells 19-20/A in diameter. 



In Sphagnum bogs. Wis. 



Trachelomonas armata ( Ehrenb. ) Stein 1883, PI. 22, Fig. 37 



PL 83, Fig. 32 



Test broadly ovate, flagellum aperature in a collar, surrounded 

 by a circle of erect spines in some varieties; wall spiny in the 

 anterior region with sparsely scattered spines over the midregion, 

 and with long backwardly directed spines in the posterior part; 

 test 22/A in diameter, 38— 40/^ long, including spines. 



Euplankter and tychoplankter; in ponds. Wis. 



[410] 



