128 THE AMERICAN MIDLAND NATURALIST 



Aquatic Life: With Special Reference to Entomostraca. 



BY JOSEPH STACK. 



The present paper is the result of a zoological survey of 

 Beimiller's Cove, Cedar Point, Ohio, and of numerous ponds and 

 streams in that vicinity, nearly all the work being done on inverte- 

 brate forms. The chief problem was on the habitat of Entomo- 

 straca and the environic conditions a:7ecting them. The forms 

 most abundant in the cove, and most often observed, belong to the 

 two sub-classes Phyllopoda and Copepoda. The nauplius stage 

 was considered by itself at all times. 



During the summer, several trips were taken to neighboring 

 bodies of water and the data gathered on these trips is included 

 in this survey. 



Cedar Point is a peninsula, not over one mile wide at its widest 

 point, extending eastward for seven miles into Lake Erie from the 

 north-central part of Ohio, separating Sandusky Bay on the south 

 from Lake Erie on the north. Cedar Point proper is located at 

 the end of this peninsula and Ohio State University Laboratory 

 is located two miles east of Cedar Point on Beimiller's Cove, at 

 which place most of this survey was made. 



Beimiller's Cove is situated in an ideal place for studying 

 aquatic life. It is separated from Lake Erie on the north by 

 Cedar Point, which is one quarter of a mile wide at this place. On 

 the south it is separated from Sandusky Bay by a narrow peninsula 

 about one half mile long which is an extension from the Point 

 proper. The west portion of the Cove cuts into the Point ending 

 in a marsh. The Cove opens into Sandusky Bay on the south- 

 east side. With such aquatic surroundings the opportunity for a 

 comparative study is unlimited, a point that will be considered 

 in the survey. 



To obtain more accurate data on the habitat and environic 

 conditions aiiTecting the Entomostraca in Beimiller's Cove, stations 

 were established where different environmental conditions prevailed 

 and these places were subjected to careful study. These stations 

 were visited every day and the day following the visits was spent 

 in the laboratory identifying and determining the specimens 

 collected. On account of the large area of the Cove it required a 

 whole day to make the complete trip to all the stations. 



