THE EUGLENOIDINA OF OHIO 379 



the posterior end rounded. 

 El Posterior tooth distinct and approxi- 

 mately as long as body. 

 Fi Transversely oval with lateral 



wing-like processes. . . 15. P. nordstedtii 

 F- Elongately oval or cylindrical with- 

 out wing-like process. . 16. P. setosa 

 C^ Posterior tooth either much shorter than the 

 body or absent. 



D' Posterior end acute, in some species elon- 

 gated into a tooth-like process. 

 E' Posterior end with long tooth-like 

 process V2 to % the length of the 



body 17. P. striata 



E- Posterior end without long tooth-like 

 process. 



F^ A single large annular paramylon 

 granule present. 



Qi Posterior end suddenly nar- 

 rowed. ... 18. P. oscillans 

 G- Posterior end gradually nar- 

 rowed. ... 19. P. parvula 

 F- Two large annual paramylon 

 granules present. 



Gi Elongately oval, gradually nar- 

 rowed posteriorly, the length 

 approximately 3 times the 

 diameter. . . 20. P. clavata 



G- Oval, more broadly rounded 

 posteriorly, the length ap- 

 proximately 2 times the di- 

 ameter. ... 21. P. pusilla 

 D^ Posterior end rounded. ... 22. P. dangeardii 



1. P. anacoelus Stokes (Fig. 6, PI. XVI) . 



Oval or spherical with margins concave and posterior spike 

 short and uncinate; periplast (?) ; flagellum approximately as long 

 as the body. 



Reproduction (?). 



L. 42/x. D. 35/^(?). 



Distribution, cosmopolitan. U. S. A., Western New York; 

 Austria (Prague). Shallow ponds. 



2. P. alata Klebs (Fig. 7, PI. XVI) . 



Oval or spherical with lateral margins much expanded and 

 posterior spike short and decidedly uncinate ; periplast longitudi- 



