The Prodncfifily of Fish Food in Oneida Lake 167 



The Sp/ucriidce of Lower South I^ay consist of small indi- 

 viduals with slij^ht shells and more or less weak hinges due 

 to some physical property of the water, perhaps a lack of Hme. 

 The maximum development of this family, both in species and 

 individu.'ils, api)ears to be in comparatively deej) water. 



CLASS GAS'J'ROLODA 

 order prosol? ranch [ata 



Family Viviparid/E 

 Genus Vivipara Lamarck 



47. Vivipara contectoides W. G. Binney. 



CVjllected from a mud bottom in nine feet of water. Only 

 one specimen, half grown, was found off Frenchman Lsland in 

 9 feet of water (Field No. 1031), and this was probably 

 brought to its location by currents. This species is abundant 

 in the west end of the lake, near Ijrewerton, where it lives on a 

 sandy bottom. 



Genus Campeloma Rafinesque* 



48. Campeloma integrum (DeKay). Not collected in 1916. 



49. Campeloma decisum (Say). 



Collected from a sand and clay bottom in water one and a 

 half to five feet deep. More abundant on a clay bottom. The 

 majority of the individuals of decisum collected in 1916 (July) 

 were young or immature, adults being very scarce. . In 191 5 

 adults were abundant in Frederick creek, and very few imma- 

 ture specimens were found. It seems evident that the young 

 of this species are born in the spring and attain their first 

 year's growth by September or early October. Information 



* Pilsbry has recently shown that this familiar name must give way to 

 Amhloxis, which is an earlier name than Campeloma. It is much to be 

 regretted that this old familiar name should have to be changed in favor 

 of the other more or less ambiguous name of Rafinesque. However, as 

 Pilsbry remarks, if the nomenclatorial rules demand such a procedure 

 we might as well get used to the change at once. For the sake of 

 uniformity with the previous bulletin the old name Campeloma is 

 retained for these shells. {See Pilsbry '17, pp. iii, 114.) 



