POND ANIMALS 



153 



In the pond formation proper, the fate of the pond early becomes 

 evident along the margin. This will be discussed in connection with 

 swamps and marshes. The discussion of the areas properly called 

 marshes and swamps is the most complex of all our discussions, and will 

 be taken up in the chapter on swamps, marshes, and temporary ponds. 



Tables XXVII-XXXIII show animals recorded from the series of 

 ponds at the head of Lake Michigan (Stations 32-37). 



TABLE XXVII 



Sponges 



TABLE XXVIII 



Leeches 



TABLE XXIX 



Sphaeridae and Unionidae 



