THE EUGLENOIDINA OF OHIO 395 



30. T. fluviatilis Lemm. (Fig. 6, PI. XX). 



Oval, smooth or somewhat rough, with neck-like process trans- 

 versely truncate, gradually narrowed posteriorly into a long (5.5;«.) 

 spike ; flagellum ? 



L. 28.7-34;u. D. 12-12.5^. 



Distribution, Siam. Plankton Menam River. 



Var. curvata Lemm. has a shell with L.63/x and D.23/i, with the 

 posterior spike (16.5/x) curved. 



31. T. schauinslandii Lemm. (Fig. 7, PI. XX). 



Transversely oval, covered with fine granulations, with anter- 

 ior neck-like process ; gradually narrowed posteriorly into a spike ; 

 flagellum ? 



L. 27.5/.. D. U,x. 



Distribution, Siam. Plankton Menam River. 



32. T. ensifera V. Daday (Fig. 8, PI. XX). 



Spherical or transversely oval, smooth, with anterior neck-like 

 process and massive (42-70/x) posterior spike; flagellum ? 



L. 130;u. D. 44/x. 



Distribution, Paraguay. Swamps and bogs. 



Var. ornata Lemm. has the median part of the shell covered 

 with minute elevations. 



33. T. acanthostoma Stokes (Fig. 9, PI. XX). 



Spherical, finely punctuate ; flagellum opening with two irreg- 

 ular rows of short spines. 

 L. 36.5/t. 

 Distribution, North America. Ponds. 



34. T. armata (Ehrenb.), (Fig. 10, PI. XX). 



Broadly oval, not punctuate, with a circular row of compara- 

 tively long spines at posterior end ; terminal spike absent; flagellum 

 opening thickened or with low toothed collar; flagellum 2 times 

 length of body. 



L. 29-64^. D. ? 



Distribution, Cosmopolitan? Standing water and Plankton. 



Var. steinii Lemm. Possesses an anterior wreath of short spines 

 behind a circle of longer spines. 



