424 OHIO BIOLOGICAL SURVEY 



L. 20-25/x. D. 10-15/i. 



Distribution, cosmopolitan. Standing water. 



Var. acuminatum Lemm. is oval, broadened posteriorly, with 

 sharp tip. 



Ohio, jar of decaying Nelumbo from E. Harbor, Lake Erie 

 (Jennings). Algae from logs of basket factory, Sandusky Bay, 

 and also from College Lake, Columbus (Landacre). 



*2. E. ovatum Stokes (Fig. 7, PL XXVI). 



Oval, emarginate anteriorly; 10-12 longitudinal striae; pri- 

 mary flagellum about as long as body ; secondary flagellum approxi- 

 mately 2 times length of body; rod-like organ attaining posterior 

 part of body. 



L. 25-28/x. D. 10-12/.,. 



Distribution, North America. Infusion of dead leaves. 



Hamilton, 0., storage reservoir; Cincinnati, 0., upper storage 

 reservoir. 



3. E. obliquum Klebs (Fig. 8, PI. XXVI). 



Oval, broadest anteriorly, end diagonally truncate; periplast 

 weakly striate longitudinally; rod-like organ only attaining the 

 middle of the body; primary flagellum about length of body; sec- 

 ondary flagellum li/o times length of body. 



L. Ib/x. D. l.bfx. 



Distribution, Europe. Standing water. 



14. Gen. CLAUTRIAVIA Massart. 



Form oval, free swimming; possessing a single flagellum 

 directed posteriorly instead of anteriorly; pellicula rigid; mouth 

 anterior, ventral; vacuole posterior left area of body; paramylon 

 evident. Two species. 



Reproduction by longitudinal division. 



Distribution, Belgium. 



This genus undoubtedly represents a form belonging to the 

 subfamily Anisonemeae in which the anterior flagellum has been 

 lost in the process of the evolution of the species. The first repre- 

 sentatives were found by Massart from a culture of algae obtained 

 at Nieuport on the Belgian coast from a fresh water ditch. While 

 noted as free swimming, the movements are rather "tad-pole" like, 

 dependent on the posterior flagellum. 



