112 The Ohio Journal of Science [Vol. XX, No. 4, 



multiplied rapidly in laboratory cultures, especially in those 

 containing EuglencE, which seem to be an important item in 

 the food of Coleps. Dividing individuals were always common. 

 Length 45-64jLi; diameter 22-35/x. 



Didinium nasutum (Miiller). 



One individual was taken in February on alga-covered 

 poplar roots at Station G. 



Length 83^. 



Family Trachelinidce. 



Amphileptus anser Ehrenberg. 



After the material had stood in the laboratory two weeks, 

 several individuals were found in algae from Station G, taken 

 on January 24. 



Length 208iu. 



Lionotus fasciola (Ehrenberg). 



This organism was common throughout the. period of study 

 in algae from Stations D and G. 



Length 112-370^. 



Lionotus varsaviensis Wrzesniowski. 



One individual was taken on March 7 in sediment from a 

 stone near the outlet of the larger pond (Station K). 



Length 96)U. 



Lionotus vermicularis Stokes. 



More than one individual of this species was never taken 

 in a collection, but it was taken during the entire period of 

 study. It was found in sediment at Station F, in algae from a 

 submerged stone (Station G), and at the point where the spring 

 water enters the larger pond (Station E). The writer was 

 interested in observing the manner of feeding. The animal 

 moved slowly along, came in sudden contact with a Coleps, 

 which almost immediately became motionless. The small 

 ciliate was then sucked down through the gullet of the Lionotus. 

 The digestive juices acted so quickly that after fifteen minutes, 

 Coleps could not be distinguished from the surrounding pro- 

 toplasm. 



Length 400-666)u. 



