382 OHIO BIOLOGICAL SURVEY 



Distribution, North America. Streams and ponds. Storage 

 Dam, Columbus, 0. 



Stokes notes the habitat in connection with Myriophyllum, 



10. P. brevicaudata (Klebs) , (Fig. 5, PI. XVII) . 



Oval, without spine and with dorsal fold reaching posterior 

 end ; periplast longitudinally striate ; flagellum as long as body ; 

 paramylon one annular granule. 



Reproduction ( ?) . 



L. 31-35/x. D. 23-25/x. 



Distribution, Europe. In standing water. 



11. P. stokesii Lemm. (Fig. 6, PI. XVII). 



Broadly oval to spherical with dorsal fold attaining posterior 

 end ; periplast longitudinally striate ; flagellum as long as body ; 

 paramylon 1 round granule in posterior part of cell. 



Reproduction ( ?) . 



L. 46/x. D. 43-46/x. 



Distribution, North America. In pools. 



12. P. hispidula (Eichw.), (Fig. 7, PI. XVII). 



Oval with short straight posterior spike and tubular opening 

 for flagellum ; periplast longitudinally striate, the striae covered 

 with minute spines ; flagellum as long as body ; paramylon either 

 discoid or rod-like. 



Reproduction (?). 



L. 30-55/x. D. 18-33/x. 



Distribution, cosmopolitan. Standing water. ° 



This is probably the species figured but unnamed in Conn's 

 paper on the protozoa of Connecticut. 



13. P. monilata Stokes (Fig. 8, PI. XVII). 



Spherical, covered with wart-like processes, posterior spike 

 straight; flagellum as long as body, arising from a minute eleva- 

 tion; paramylon ( ?). 



Reproduction (?). 



L. 3V D. 30;a(?). 



North America. Ponds. 



*14. P. pyrum (Ehrenb.), (Fig. 9, PI. XVII). 

 Oval, broadest anteriorly, provided posteriorly with elongate 

 straight spine ; periplast spirally striate ; flagellum as long as body ; 



