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



green flagellate, Carteria multifilis. At the end of the month, 

 following a heavy storm, all the sediment on the leaves dis- 

 appeared, and for this reason collecting was discontinued at 

 this station. 



The colonial flagellate Syniira uvella was common in this 

 sediment. The larger ciliates, Loxodes rostrum, Stentor poly- 

 morphus, Paramaecium caiidatum and Spirostomum amhiguum 

 were conspicuous. 



STATION B. 



Black sediment at bottom, in stagnant, shaded water. 



Station B was at the extreme southeast edge of the smaller 

 pond, very close to the preceding station, as is shown by the 

 similarity of forms taken at the two localities. The water was 

 full of decaying leaves and was three inches deep. It was shaded 

 throughout the day, except for a few hours in the early morning. 

 In early October, when collecting began at this station, the water 

 was covered by a compact mat of duckweed {Lemna trisidca 

 Linnaeus) which shut out the light almost completely from the 

 water beneath. As the temperature lowered, this plant became 

 scanty, but never entirely disappeared. A pipette was inserted 

 between the duckweed and the fine black sediment from the 

 bottom was taken for examination. Carteria midtifilis was 

 present in this material during October, but was not nearly 

 so abundant as at Station A. The larger ciliates, Loxodes 

 rostrum, Frontonia leucas, and Spirostomum amhiguum were 

 common. 



STATION C. 



Floating algae, in water well exposed to light. 



This station was on the west side of the peninsula which 

 extends into the larger pond. The water was about six inches 

 deep, contained little decaying material, but often became 

 turbid. The sun shone on this part of the lake throughout 

 the day. In October an abundance of algae (mostly Spirogyra) 

 floated at the surface and some of these were taken for examina- 

 tion. They became less plentiful as cold weather came on, 

 until in December they entirely disappeared. In February, 

 after the ice had melted, the algae resumed growth. The 

 ciliates and flagellates were well represented at this station 

 during the fall and again in February. The most abundant 



