4 University of Michigan 



of about twenty-five by seventy feet where a wagon road cut 

 through the pond. The maximum depth of water here was 

 about twelve inches. In the part of the plant zone occupying 

 the deepest water the vegetation consisted of a species of 

 Potamogeton, together with Utricularia and scattering Scirpus 

 validiis; surrounding this was a zone of sedges {Car ex filifor- 

 niis), Iris versicolor, Phragmites, and other plants of similar 

 habit. The bottom was quite mucky, with scattered areas of 

 almost clean sand and of partly decayed leaves, etc. Besides 

 the Hemiptera, frogs, tadpoles, young catfish, small Crustacea, 

 insect larvae of various orders, and certain beetles were quite 

 abundant. 



At the end of August the water in this pool .was reduced to 

 an area about five by thirty feet in extent, and the consequent 

 concentration of the aquatic life made collecting very easy. 



Some collecting was also done in the adjacent pool, about 

 fifteen yards west of the first. This pool was a little smaller 

 than the other, and had no direct connection with it or with the 

 lake. The bottom here was rather marly, wath Chara, Equise- 

 tum, and Scirpus forming the dominant vegetation. The fauna 

 of the two pools was quite similar. 



Station IV was the small cove at the south-west corner of 

 North Fishtail Bay. It covered an area of about half an acre, 

 and was partially separated from the main lake by a wooded 

 point on the south, which curving northward in an L-shaped 

 tongue, efifectually protected this little cove from wind and 

 waves. Trees and bushes grew dowai to the edge of the w^ater 

 on the west, south, and east. 



The w^ater here was clear, and not over eighteen inches deep 

 in most of the cove ; and, being sheltered from wave action 

 and exposed to the sun, it tended to follow the temperature of 

 the air more closely than did the main body of the lake. The 



