The I'rodttclh'Uy of Pisit Pood in Oneida Lake 201 



Family Hyc.robatid/E 



Arrhenurus americanus Lebertia porosa Lebert. 



major Marslial!. Limnesia species. 



Arrhenurus marshalli I'icr- Limnesiopsis species. 



si^. Frontipoda americana Mar- 

 Arrhenurus superior Mar- shall. 



shall. Unionicola species. 



Arrhenurus s])ecies (adult Fiona s])ecies. 



and nyiHi)li). Atractides artaacetabula 



Lebertia artaacetabula Mar- Marshall. 



shall. Hygrobates species. 



Water mites were ahundanl in a few hal)itats in hianienloiis 

 algae, associated with chirononiid larvic, small crustaceans, 

 olig'ochcCte worms, and gastropod mollusks. They were found 

 on all bottoms except gravel and were most abundant on 

 boulder and least abundant on sandy clay bottoms. The 

 majority of mites were found in water from one to four feet 

 deep, but a few individuals of Hygrobates, Unionicola, Fiona, 

 Limnesia, and .Irrhcnurus extended to a depth of 8-15 feet. 

 Identifications by Miss Ruth Marshall. 



Summary 



The preceding list of associated animals includes 21 groups 

 higher than families, 48 families, 93 genera, and 76 identified 

 and 54 unidentified (by genera only) species, a total of 130 

 species. A new species of Cccnis and a new Spongilla 

 were discovered. The relation of these species to the higher 

 groups is shown in Table No. 51. 



The material collected in 191 5 contained 61 genera, and 54 

 identified and 23 unidentified species, a total of yy species. 

 The superiority of the unit area method of collecting is here 

 demonstrated. Of the unidentified material contained in the 

 1916 collections, many of the genera contain several species 

 so that there are probably double the number of species here 

 recorded. It is i)ossible that as many as 250 species are really 

 represented in these collections of 1916. The majority of 

 these animals are of value as food for fish. 



