370 OHIO BIOLOGICAL SURVEY 



Reproduction by longitudinal division. Encystment not 

 known. 



L. 375-490;u. D. 30-45/.. 



Distribution, cosmopolitan. 



The species is a large and interesting one, extremely well 

 adapted for biological instruction in laboratory work. After once 

 having found a locality it may be obtained in abundance. Longi- 

 tudinal division of the mature form has been observed to take place 

 within five hours without the reconstruction of the second para- 

 mylon granule. This was from aquarium material during mid- 

 winter, but at ordinary room temperature during the day. 



Ohio, Gambier; E. Swamp on S. "Bass Island, Lake Erie (Jen- 

 nings) ; Sandusky Basket Factory Cove, L. Erie (Landacre). 



-28. E. simulacra n. sp. (Fig. 5, PI. XIV) . 



Elongately cylindrical or slightly flattened, rounded anteriorly, 

 posteriorly with long acute tip, metabolic; periplast without pro- 

 nounced spiral striations ; chloroleucites disciform, numerous ; 

 pyrenoids( ?) ; paramylon in the form of two large spherical gran- 

 ules, one anterior and one posterior to the nucleus, which is round. 



Reproduction ( ?). 



L. 75/x. D. 8-8.5/.. 



Distribution, Ohio, Fremont. 



This interesting species is described from several specimens 

 observed May 6, 1913, obtained in cultures procured from Fre- 

 mont, 0., early in the spring. It differs from E. oxyuris by the 

 presence of two large spherical instead of oval paramylon gran- 

 ules, by the rounder nucleus and by its much smaller size. All 

 the forms observed were nearly identical in size. Camera lucida 

 drawings were made. No swimming movements took place, but 

 instead a series of slow, twisting contortions. 



29. E. intermedia (Klebs), (Fig. 6, PI. XIV). 



Elongately cylindrical with short tip, decidedly metabolic; 

 periplast weakly striate spirally ; flagellum short ; chloroleucites 

 disciform, numerous; pyrenoids absent; paramylon consists of 

 2-3 ( ?) large rod-like granules anterior and posterior to the nucleus. 



Reproduction, division in gelatinous membrane. 



L. 120-135/x. D. 8-12.5/x. 



Distribution, Europe. 



