Feb., 1920] The Protozoa of Mirror Lake 113 



Lionotus wrzesniowskii Kent. 



This species was common in one collection, that of November 

 13, of algae growing at the point where the spring water enters 

 the larger pond (Station E). 



Length 518/x. 



Loxodes rostrum Ehrenberg. 



This organism was very abundant during the fall in sediment 

 at Station B, where it utilized the plentiful Carteria cells for 

 food. Many of the animals were strangely distorted; some were 

 extremely concavo-convex ventro dorsally; in many others the 

 protoplasm was protruded on various parts of the cell. The 

 organisms were apparently little inconvenienced, and their 

 behavior was unmodified except for a peculiar movement, 

 which consisted of a revolution to the right on the longitudinal 

 axis. 



Length 160-288^; breadth 48-80/1. 



Family Chlamydodontidce. 



Nassula ornata Ehrenberg. 



This species was common during November only, on alga- 

 covered poplar roots (Station D). The cells were scarcely 

 colored, but contained many food vacuoles. 



Length 250-296ai; breadth 118-148iu. 



Chilodon cucuUus (Miiller). 



This form was infrequent in algae from the bowl of the 

 spring (Station J) and in algae from Station E. It became 

 abundant in February at these places. About this time it was 

 common in sediment from a stone near the outlet of the larger 

 pond (Station K) and in algae taken from submerged posts 

 (Stations I and I')- 



Length 112-208^. 



Chilodon fluviatilis Stokes. 



This form was common during December in algae at Station 

 H and in sediment from Station A. 

 Length 60/i. 



