The .Prodiic/iz'ily of Fish Food in Oneida Lake 127 



2. Submerged Plants. The submerged vegetaticju on the 

 whole contained but few animals. In spots, however, mostly in 

 sheltered places, animals were quite abundant. In Habitat 

 No. cxv, a quiet lagoon with mud bottom, the water, which was 



Table No. 30. Population of Typha Unit 



Mollusks 



Planorhis hinncyi, A'oung i 



Ancyhis parol Ir Ins 2 



3 



Associated animals 

 Hirudinea 



Glossiplwiiia sfagualis i 



Erpobdella punctata i 



4 



Amphipoda 



Hyalclla kuickcrbockcri i 



Diptera 



Chironomid larva i 



four feet deep, was almost choked with vegetation (see the 

 vegetation map, fig. 10). Among the plantf,, Potanwgeton inter- 

 rupius and M yrio phyllum veriicillatum had an abimdance of 

 animals on the leaves. The population of a 64 square inch unit 

 is shown in Table No. 31. 



Table No. 31. Population of Vegetation, Habitat No. CXV 



Potamoc/eton intcrntptus X .... 



Myriophytlnm 7'crticillatum X 



Acclla haldciiiaui 2 



Planorhis part'iis 22 .... 



Physa Integra 10 30 



Total 32 32 



In this lagoon there is an area of .60,000 square feet, the 

 water being four to six feet deep, and the total animal popula- 

 tion is calculated to be not less than 8,640,000 individuals.* The 



* Computation : 60,000 square feet X 144 square inches = 8,6 10,000 

 square inches -^ 64 square inches = 135,000 unit areas X 64 mollusks = 

 8,640,000 mollusks. 



