523 



got a greater variety of species in shallow water along shore near 

 the mouths of small tributaries. From the full current of the river 

 only a dozen specimens of a shiner (Notropis atherinoides) were 

 captured, and these by dynamite explosions, the set-nets coming up 

 empty. By the use of small seines and dynamite we obtained in 

 shallow water along shore examples of the species shown by the fol- 

 lowing list. 



A comparison of the fourth column with the others preceding 

 makes it probable that most of the specimens taken from the river 

 here were migrants from the creeks, and if not it is certain that 

 the creek waters along shore were being commonly sought by them. 

 A notable exception is the abundant shiner {N. atherinoides) , which 

 we shall find the commonest fish in our river collections all the way 

 to Chillicothe. 



The microplankton was, as might be expected, virtually the same 

 as above, except that the number of organisms per cubic centimeter 

 was only about four fifths as great below, possibly because many of 



