The Productivity of Fish Food in Oneida Lake i8i 



91. Galba humilis modicella (Say). 



Found in two habitats, one a lagoon among floating tilamen- 

 tous algae {CEdogonium), the other in Tuttle Brook, a tribu- 

 tary of Chittenango Creek, near the shore in a few inches of 

 water among CEdogonium and Cladophora algte. In the latter 

 habitat the little Lymnaeas were very abundant, crawling on 

 the shore at the margin of the w^ater or over the surface of the 

 algae. The specimens collected measured 5 mm. in length and 

 were quite typical in form. 



Family Succineid^ 

 Genus Succinea Draparnaud 



92. Succinea avara Say. Not collected in 1916. 



93. Succinea retusa Lea. 



Small specimens of this species were very abundant along 

 the shore at Fred Becker's landing, crawling over the rocks 

 on the shore among sedge. 



Summary 



The field w'ork of the 1916 season increased the number of 

 species of fresh- water mollusks in the lake from 62 to 91. 

 The relation of the species collected in 191 5 to those obtained 

 in 1916 is shown in Table No. 48 



Table No. 48. Relation of Mollusks to Collecting Season 



