190 College of Forestry 



cases is almost if not quite impossible. The great abundance 

 of these animals indicates a food supply for fish of large size 

 and ready access. Identifications by Dr. Paul S. Welch. 



PHYLUM ARTHROPODA 



CLASS CRUSTACEA 



The abundance of the small crustaceans, classed generally 

 as Entomostraca, indicates a large food supply of this impor- 

 tant class of animals which are so much used by many fish, 

 especially young. The food value of these small animals has 

 already been shown (Baker, '16, pp. 298-300). 



Order Piiyllopoda 

 cladocera 

 Fa^mily Sidid.e 

 Sida crystallina (Miiller). Latona setifera (Miiller). 



Family Daphnid.e 



Simocephalus serrulatus Simocephalus v e t u 1 u s 



(Koch). (Miiller). 



Family Lynceid.^. 



Acroperus harpae Baird. Chydorus sphaericus (Miil- 



Alona quadrangularis (Mill- ler). 



ler). Eurycercus 1 a m e 1 1 a t u s 



Camptocercus rectirostris (Miiller). 



Schdl. Pleuroxus denticulatus 



Birge. 



The ten species of Cladocera represented in the collection 

 are all bottom forms living for the most part in the filamentous 

 algae. Four species were found on all varieties of bottom. In 

 depth two species range to 9 feet but the greatest number of 

 species live between three and four feet in depth of water (see 

 Table No. 49). A study of the plankton would reveal many 

 additional species as there is probably a large plankton fauna 



