454 



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



TABLE 15. 



Plankton. The plankton catth was taken within a foot of 

 the surface. The quantitative results are given in Table 16. 

 It will be seen that the blue-green algse comprised by far 

 the greatest part of the catch. This abundance is not a 

 casual occurrence. Sample towings taken in other years offer 

 ample evidence of similarly large quantities of algae. The 

 figures given in the table have reference to the number of algal 

 filaments. 



TABLE 16. 

 Plankton Quantitative Results. 



Species 



Blue-green algse 



Pleodorina 



Nauplius 



Pediastrum 



Ceratium 



Rotifera 



Discussion. All of the animals inhabiting the pond and 

 the types of environment in which each was found are given in 

 Table 17, page 455. About one-third of the total number of 



