384 OHIO BIOLOGICAL SURVEY 



cave ventral surface; periplast spirally striate; flagellum about 

 length of body ; paramylon 1 large discoid granule. 



Reproduction ( ?). 



L. 26/x. D. lO/ji. 



Distribution, Europe. Standing water. Storage Dam, Colum- 

 bus, 0. 



19. P. parvula Klebs (Fig. 14, PI. XVII). 



Oval, broadest anteriorly, posterior end acute but without 

 pronounced tooth; periplast spirally striate; flagellum as long as 

 body; paramylon 1 annular granule. 



Reproduction by free longitudinal division as well as by 

 division within an envelope. 



L. 17-30/x. D. 9-10/x. 



Distribution, Europe. Standing water. 



20. P. clavata Dang. (Fig. 15, PI. XVII). 



Conical gradually narrowed posteriorly; periplast spirally 

 striate ; flagellum about 2/3 length of body ; paramylon 2 annular 

 or several rod-like granules. 



Development ( ?). 



L. 25/x(?). D. 10/.(?). 



Distribution, France. 



Dangeard in the description of the species fails to note the 

 size, stating, however, that it is allied to P. oscillans. Conse- 

 quently provisional dimensions are given. 



21. P. pusilla Lemm. (Fig. 16, PI. XVII). 



Elongately oval, with wing-like thickening laterally, the poste- 

 rior end slightly pointed ; periplast spirally striate ; flagellum 1/2 

 length of body ; paramylon, 2 annular granules. 



Reproduction ( ?) . 



L. 20/x. D. 7.5/7. 



Distribution, Europe. Standing water, 



22. P. dangeardii Lemm. (Fig. 17, PI. XVII). 



Elongately oval with rounded ends, often slightly narrowed 

 posteriorly; periplast spirally striate; flagellum as long as body; 

 paramylon, 1 annular granule. 



Reproduction ( ?). 



L.(?). D.(?). 



Distribution, France. 



