452 



The Ohio Joiinml of Science [Vol. XIX, No. 8, 



below the surface of the water on stones. The beetles were 

 running over the exposed portion of the stone pile near the 

 water's edge. 



TABLE 13. 



Station 3. Along the west side of the pond a pile of stones 

 projected above the surface of the water. Among them there 

 was a group of reeds. The conditions are shown on page 

 453. The animals named in Table 14 were taken in four to 

 five inches of water from stones about the roots of the reeds. 



TABLE 14. 



Station 4. This covers the central area and also includes 

 the plankton and the free swimming forms of the pond as a 

 whole. As mentioned previously several lilies had become 

 established in the center of the pond. Their roots were imbedded 

 in three inches of silty mud. A list of the species is arranged 

 in Table 15, page 454. 



