418 OHIO BIOLOGICAL SURVEY 



spirally; primary flagellum 2 times length of body; secondary 

 flagellum slightly longer than body. 



L. 3V D.(?). 



Distribution, Europe. Stagnant pools. 



7. Gen. TROPIDOSCYPHUS Stein. 



Form oval, pointed anteriorly and posteriorly; often slightly 

 metabolic; 8 prominent longitudinal carinae; anterior flagellum 

 long, posterior flagellum short; principal vacuole with smaller 

 accessory vacuole ; rod-like organ absent ; movement creeping. 



Habitat, fresh water. 



Distribution, cosmopolitan. 



The genus consists of two species. 



TABLE OF SPECIES. 



Ai Anterior end of cytopharynx with two prominent lobes; 



L. 50-60/". . . . . . . . 1. T. octocostatus 



A- Anterior end of cytopharynx rounded . . . 2. T. cyclostomus 



1. T. cyclostomus Senn (Fig. 5, PI. XXV). 



Broadly fusiform, with anterior end curved at extremity into 

 a lip-like process ; pointed posteriorly ; 4 well developed longitudi- 

 nal carinae present; primary flagellum 11/2 times length of body; 

 secondary flagellum 2/3 length of body. 



L. 16^. D. 10-lV 



Distribution, Europe. Thus far found only in a small stream 

 near Halle, Germany. 



2. T. octocostatus Stein (Fig. 6, PI. XXV). 



Broadly fusiform, emarginate anteriorly with two lateral 

 points; pointed posteriorly; primary flagellum 11/4-2 times length 

 of body ; secondary flagellum 1/3-1/4 length of body. 



L. 35-63/x. D.(?). 



Distribution, Europe. Pools rich in aquatic vegetation. 



8. Gen. NOTOSOLENUS Stokes. 



Form oval approaching rectangular; strongly compressed 

 dorso-ventrally ; concave dorsally, convex ventrafly; body rigid, 

 not metabolic; two flagefla, the length of the anterior 1-1 1/2 times 

 length of body, length of posterior 1/3 length of body; mouth 

 oval ; pellicula smooth ; principal vacuole with accessory contractile 



