THE EUGLENOIDINA OF OHIO 407 



swimming- rotating movement occurs in a few species (Heteronema 

 acus Ehrenberg, Euglevop.sis rorax Klebs.) ; pharynx distinct; 

 nourishment by means of solid particles taken into pharynx ; para- 

 mylom present. 



Inhabitants of fresh water, with representatives of a few 

 genera (Urceolus, Anisonema, Ploeotia, Entosiphon) also found 

 in salt water. 



The members of this family are easily overlooked when study- 

 ing the Protozoa by reason of the small size of many of the species 

 as well as their transparent bodies. Furthermore the majority 

 of the forms are not of frequent occurrence. 



TABLE OF GENERA. 



Ai Flagellum directed posteriorly absent; a single 

 anterior flagellum present. 

 B^ Rod-like organ absent. 



C^ (Subfam. Euglenojiseae) Free-swimming 

 with a rotating movement; weakly meta- 

 bolic; striate spirally ... 1. Gen. Euglenopsis 

 C2 (Subfam. PetaloTnonadeae) Creeping; not 

 metabolic; not striate spirally. 

 Di Anterior end pointed; contractile 



vacuole marginal .... 2. Gen. Petalomonas 

 D^ Anterior end truncate; contractile 



vacuole anterior .... 3. Gen. Scytomonas 

 B- (Subfam. Peranenieae) Rod-like organ present. 



Ci Form spindle shaped .... 4. Gen. Peranema 

 C2 Form flask shaped .... 5. Gen. Urceolus 



A." Flagellum directed posteriorly present; an ante- 

 riorly directed flagellum also usually present. 

 Bi Granules not arranged spirally in the ectoplasm; 

 species not exceeding 60m. in length. 

 C^ Two flagella arising from same area pres- 

 ent, one directed anteriorly, the other 

 posteriorly. 



D' (Subfam. Heteronemeae) Posterior 

 flagellum shorter than the anterior 

 flagellum. 



El Body not flattened; weakly meta- 

 bolic ..... 6. Gen. Heteronema 

 E- Body flattened; not metabolic. 



Fi With 6-8 longitudinal ribs. 7. Gen. Tropidoscyphus 

 F- Without longitudinal ribs. 8. Gen. Notosolenus 



D- (Subfam. A)}iso)iei)ic(ie) Posterior flag- 

 ellum usually longer or at least equal 

 in length to the anterior flagellum. 



