150 College of Forestry 



ANNOTATED LIST OF THE MOLLUSKS OF 

 LOWER SOUTH BAY AND VICINITY 



Gknerai, Habitat Rei.atjons 



In a I'revious paper (Baker, '16, pp. 247-2(89) I have 

 discussed the moHusks of the western end of Oneida Lake 

 collected during the 191 5 field season. Sixty-two species and 

 races of fresh-water mollusks were Hsted, representing 25 

 genera and 11 families. During the 1916 field season 29 addi- 

 tional species were collected and added to the Oneida Lake 

 list bringing the total number of species up to 91, including 

 the Sphasriid?e not yet determined as to species. This number 

 is greater by 25 than the total molluscan fauna listed by Maury 

 from the Finger Lakes region ('16, pp. 29-32). One species 

 (Margaritana margaritifera) previously reported is to be elim- 

 inated and another {Lampsilis horealis) proves not to be that 

 species but a new race of Lampsilis radiata (race oneidensis) 

 (Baker, '16a, pp. 74-77). A genus (Segmentina) is added. 

 It is highly probable that half the species of fresh- water mol- 

 lusks inhabiting the State will be found in the waters of Oneida 

 Lake when the east end, the deep water, and the small tribu- 

 tary streams are examined. The additional Sphseriidae col- 

 lected in 1916 are noteworthy, bringing the total number to 32, 

 of which 23 are of the genus Pisidium. The deeper water also 

 added several species not found in 191 5. 



Mollusks were abundant everywhere, being absent from 

 less than one -percent of the area examined. Associated with 

 the mollusks were worms, crustaceans, insect larvae, and other 

 animals, forming together a veritable microcosm, in which the 

 majority of fresh-water groups of animals were represented, 

 from Protozoa to Acarina. In point of numbers the mollusks 

 usually predominated. 



The quantitative method of study, by means of the exami- 

 nation of a large number of unit areas, has been productive 

 of valuable results not obtained in any other way. Recently, 

 Dr. C. G. Joh. Petersen ('15, p. 20) has made the statement 

 (juoted below which is full of meaning in connection with the 



