25G 



BULLETIN UNIVKRSrrr ol 



.Ml iNT.VXA 



summer. While this is particularly true of the land species, it applies 

 also to water forms. The pond inhabiting animals in spring are given 

 more extensive territory, thus increasing the food supply and furnishing 

 better opportunity for the development of the young. The rushing waters 

 of the rivers, except in shallow and swampy areas along shore, are almost 

 destitute of shells. In the western part but one bivalve is found in the 



•^ 



sand bars of the rivers, the common black clam. Margaritana margariti" 

 fera L. In the eastern part, tributary to the Atlantic, two Unionidae are 

 recorded, Anodonta plana L., and Anodonta ovata L. In each case only 

 the young were taken. Three other small bivalves, to be found among 

 the vegetation of ponds, have been collected, one from the western and 

 two from the eastern part of the state. It is thus seen that the total list 



