362 OHIO BIOLOGICAL SURVEY 



L 50-60/x. D. 14-18/x. 



(var. olivacea L. 72-80,u. D. 16/j..) 



Distribution, cosmopolitan. Storage Dam, Columbus. 



Many other species have been erroneously classified as E. 

 viridis in ordinary biological instruction. The posterior position 

 of the nucleus, together with the single stellate group of chloro- 

 leucites, should easily distinguish it from several closely allied 

 forms. The following varieties have been noted: var. mucosa 

 Lemm., surrounded by mucous in swimming stage and only slightly 

 metabolic; var. olivacea Klebs, distinguished primarily by the 

 olive green color of the chloroleucites and the tendency of these 

 to be separated into disciform fragments, together with the larger 

 size of the form. Dangeard has suggested that the var. hijal'ma 

 Klebs possibly belongs to the genus Astasia, inasmuch as it is 

 deprived of chlorophyl and possesses only a rudimentary stigma. 



Hiawatha Lake, Mt. Vernon, 0. ; Kokosing River, Gambier, 0. 



*2. E. geniculata Dujard (Fig. 2, PI. XII). 



Cylindrical elongate with periplast striated spirally ; flagellum 

 as long as body; stigma prominent; nucleus central; chloroleucites 

 in the form of elongate rods collected into 2 or 3 stellate masses, 

 one mass posterior to the nucleus; paramylon with pyrenoids. 



Reproduction by longitudinal division, or by encystment 

 without thickened membrane as in E. viridis. 



L. 70-85,u. D. 12-22/x. 



Distribution, cosmopolitan. Storage Dam, Columbus. 



3. E. olivacea Schmitz (Fig. 3, PI. XII). 



Fusiform, short posteriorly, metabolic ; periplast striated 

 spirally ; flagellum as long or longer than the body ; chloroleucites 

 numerous, stellate ; pj^renoids not covered with paramylon ; para- 

 mylon granules short, oval. 



Reproduction by longitudinal division. Encystment not 

 known. 



L. 68-89/1. D. 14-21/x. 

 Distribution, cosmopolitan. 



