82 ANIMAL STUDIES 



78. Egg-laying. The eggs of some leeches are stored 

 up in a cocoon like that of the earthworm, which is attached 

 to submerged plants or placed under stones. When the 

 young are able to lead independent lives they emerge with 

 the form of the parent. A leaf -like form, Clepsine, some- 

 times found adhering to turtles, fastens the eggs to the 

 under side of its body, and the young when hatched 

 remain there for several days, adhering by their posterior 

 suckers. 



