FIELD BOOK OF PONDS AND STREAMS 



are short, others long and hairlike; new individuals are pro- 

 duced by budding. They are very common, in mud or on 

 plants, in standing or flowing water. 



Fig. 112. — ChcEtogaster diaphanus, a common 

 bristleworm which feeds upon cladocerans. 



Chaetogaster. — ChcBtogaster diaphanus (Fig. 112) is a half 

 inch long, much longer than most bristleworms, and feeds on 

 little crustaceans, especially the cladocerans (p. 164) Chydorus 

 and Sphcericus. 



r,-.- ^ ' ' ■ ' _ I I I I I M I I I I I r I I 1 I I '' ''''*' ' " - j:^ 

 ^^■' ' ' I I ■ I I 1 1 I I I M 1 1 I I I I I I I I I I I 1 I 1 1 ni T^^''^^ 



Fig. 113. — Dero. (Walton. From Pratt.) 



Dero. — The lively little Dero, hardly a quarter of an inch 

 long, slips in and out of its tube or changes ends within it. 

 It is common on floating leaves from lily-pads to duckweed 

 (Fig. 113). 



Fig. 114. — Tubifex tubifex, tube-building worms 

 with their heads in the mud, and tails pointed 

 upward. (From Needham.) 



146 



