The Productivity of Fish Food in Oneida Lake 189 



Family Hirudinid.e 

 Haemopis marmoratis (Say) Moore. 



Family Herpobdellid^ 

 Erpobdella punctata (Leidy) Moore. 



Family Ichthyobdellidte 

 Pisicola species (No. 977). 



Dr. Moore states that the individuals of these leeches are 

 generally small for their species and many, especially Erpob- 

 della, are young. PlacohdeUa was collected with young adher- 

 ing to the body. It will be noted that leeches occurred on all 

 bottoms except gravel. The usual depth was from one to five 

 feet, but two species extend to deeper water, Glossiphonia 

 stagnalis to 11 feet and Glossiphonia complanata to 14 feet 

 (see Table No. 47). Individuals were nowhere abundant dur- 

 ing July, 1916. Identifications by Dr. J. Percy Moore. 



class oligocii^ta 



Family Naidid^ 



Naidium species. Dero limosa Leidy. 



Pristina species. Dero species. 



Stylaria species. 



Family Tubificid^ 



Genera et species incertus, mostly immature. 



Family Enchytraeid;e 



Genera et species incertus. All immature and impossible to 

 identify. 

 The oligochsete worms were very abundant in filamentous 

 algae and apparently living upon this plant, their bodies being 

 of the same delicate pea green color. These worms occurred 

 wherever algse were found in depths down to 14 feet. The 

 more usual depth was two to five feet. Many of the indi- 

 viduals of these worms are immature and identification in such 



