A^o. I Tii'. ill -Bay. 

 Ceratiiim (numerous) 

 Nauplius (numerous) 

 Cyclops. 



Annulata {Stylaria lucustria) 

 Rotifera. 



Diatoms (Asterionella). 

 Arcella dis9oidea. 

 Bosmina (few). 

 Amoeba proteus. 



No. I Tw. in Lake. 

 Monostyla. 

 Cerfltium longicorne. 

 Difflugia lobostoma. 

 Bosmina striata. 

 Nauplius. 

 Diatoms (Asterionella). 



141 



From the preceeding comparison we find that the planktonts 

 are more numerous in the Bay than in the Lake and in the Lake 

 they are more numerous a distance out where the shore does not 

 affect the occurrence than they are near shore. For self preservation 

 the planktonts avoid the battering action of the waves along the 

 shore. 



Pipe Creek, vSandusky. 

 July 19, 19 16. 



Pipe Creek is a typical rock-bottomed stream which begins 

 in a marsh near the Bay and empties back into the marsh. The 

 stream is about 15 feet across and a sewer empties into it at the 

 bridge near the Soldiers' Home, from where we started. The vege- 

 tation consisted chiefly of algae which was directly in the stream. 

 Also found live crayfish and many small minnows. 



Vegetation covered with Eucrangonyx and beetles; damsel 

 fly larvae were also quite abundant; small cat fish, dragon fly larvae, 

 several snails, cat fish fry and the numerous skins of crayfish which 

 had been shed. 



Townng No. I was taken below the bridge along the shore. The 

 current was moderate ; depth about 8 inches ; sewer contamination 

 present. Air temperature 32 degree C. Water temperature 32 

 degrees C. Found gamma nts, diatoms, and arcella. 



Towing No. 2 was taken from a quiet pool banked oT from the 



