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



overflow of water from the bowl is carried to the larger pond 

 through a small gutter. This place was not shaded at any time 

 of the day. Although the bowl was cleaned occasionally by 

 the caretakers, a scanty growth of algae was always present on 

 its sides. This material, together with the sediment which it 

 contained, was taken. Examination showed it to contain an 

 ^abundance of rhizopods. Actinophrys sol, Nuclearia sp.? and 

 Amoeba radiosa were most plentiful. Many others were taken 

 occasionally. 



STATION K. 



Greenish brown sediment and algae on large submerged stone 

 in turbid waters, well lighted during part of the day. 



This station was added to the list late in February. It was 

 located about a foot to one side of the outlet of the larger pond. 

 This spot receives direct sunlight in the morning and in the late 

 afternoon; the water was relatively quiet, but turbid, and about 

 three inches deep. Greenish brown sediment and algae were 

 taken from the large submerged stone at this place. Aspidisca 

 costata, Chilodon cucuUus and Stylonychia mytilus were common 

 at this station during the period of study. 



STATION L. 



Algae on submerged stone in shallow, turbid water, well exposed 

 to light. 



Station L was located at the north extremity of the island 

 in the west end of the larger pond. The water here was never 

 shaded, about three inches deep, and usually turbid. Col- 

 lections were not made here until March. Throughout this 

 month, the ciliates Glaucoma scifitillans , Spirostomum ambiguum, 

 Coleps hirtus, Aspidisca costata, Colpidium colpoda, and Peri- 

 dinium tabulatum were frequent in collections. 



STATION M. 



Fine, black sediment in clear, slowly moving water, well lighted 

 for part of the day. 



This station was located at the extreme east end of the larger 

 pond, close to the outlet from the smaller pond. The sun 

 shone here most of the afternoon. The water was clear, 

 always moving slowly, and the bottom was covered with fine, 

 black sediment. A few collections of this sediment were made 

 in March. Lacrymaria olor, Amoeba villosa, Cochliopodium 

 bilimbosum, and Heterophrys sp.? were common in this material . 



