THE EUGLENOIDINA OF OHIO 419 



vacuole anteriorly on right side of body; nucleus on left middle 

 part of body; rod-like organ not evident; movement creeping in 

 irregular manner. 



Habitat, fresh water. Three species. 



Distribution, cosmopolitan ( ?) . 



TABLE OF SPECIES. 



A^ Broadly oval or circular in outline; posterior end rounded. 

 Bi Oval, median furrow narrow, occupying about % diam- 

 eter of body . . . . . . 1. N. apocamptus 



B2 Circular, median furrow broad, occupying about % 



diameter of body . . . . . 2. N. orbicularis 



A~ Triangular in outline, emarginate at posterior end which is 



the broadest part of the body . . . . . 3. N. sinuatus 



*1. N. apocamptus Stokes (Fig. 7, PI. XXV). 



Oval, pointed anteriorly, broadly rounded posteriorly; dorsal 

 median furrow narrow; primary flagellum about II/2 times length 

 of body ; secondary flagellum 1/2 length of body. 



L. 6.5-10/x. D.(?). 



Distribution, cosmopolitan N. America, Germany, Senn. 

 Standing water with Myriophyllum. 



Hamilton, 0. Storage reservoir. 



2. N. orbicularis Stokes (Fig. 8, PI. XXV). 



Oval to circular in outline, rounded at ends; median dorsal 

 furrow broad approximating % diameter of body ; primary flagel- 

 lum 11/2 times length of body; secondary flagellum 1/2 length of 

 body. 



L. 10-11.5^. D.(?) (. 



Distribution, North America. Near bottom of shallow pools. 



3. N. sinuatus Stokes (Fig. 9, PL XXV). 



More or less triangular, broadest posteriorly with end emargi- 

 nate; dorsal furrow narrow, slightly carinate anteriorly; primary 

 flagellum II/2 times length of body; secondary flagellum 1/2 length 

 of body. 



L. 22.5/x. D. 11, X. 



Distribution, North America. Standing water with dead 

 leaves. 



9. Gen. ANISONEMA Dujardin. 



Form oval, distinctly compressed dorso-ventrally ; a ventral 

 furrow extends backward and to the right from the mouth ; body 



