The Productivity of Fish Food in Oneida Lake 187 



Fitzgerald Point, west end of Oneida Lake (Field No. 

 '1628H), on stones in water 1-3 feet deep. 



Spongilla lacustris (Linn.). 



Fitzgerald I'oint, associated with Sf>ou(/illa fragilis (Field 

 No. 1628 D). " '. 



Spongilla heterosclerifera .Smith, new species. 



Fitzgerald I'oint, west end of Oneida Lake (Field No. 

 1628), on stones in water 1-3 feet, habitat exposed to full 

 force of waves. 



Carterius tubisperma Mills. 



Between Zett Island and Shafer's boat landing, Brewerton 

 (Field No. 1632), on mud bottom in water 2 feet deep. 



PHYLUM COELENTERATA 

 Family Hydrarid.e 

 Hydra oligactis Pallas. 



This Hydra was common on plants, especially the large 

 Lake Bulrush (^c/'r/'/Y.s- occidentalis) many leaves being cov- 

 ered with this animal from the bottom to within a few inches 

 of the surface of the water. No valuation studies were made 

 of Hydra in the 1916 field work, but in 1917 this animal was 

 observed on Scirpus occidentalis in the vegetational island 

 habitats near Brewerton (Baker, '16, p. 102, fig. 29) and 450 

 individuals counted in a space of four inches. Hydra oligactis, 

 the Brown Hydra, was the only species of this group of ani- 

 mals observed in the west end of the lake. The species was 

 identified by Dr. H. S. Pratt. 



PHYLUM PLATYHELMINTHES 



class tltrbellaria 



Family Planariid.e 



Planaria dorotocephala W'oodworth. 



Collected on boulder and sandy clay bottoms in water one 

 to four feet deep. 



Planaria maculata Leidy. 



Found on boulder, sandy clay, and mud bottoms in water 

 I- 1 4 feet deep. 



