2 57 



a small amount of nuclear matter. They measure 

 55 by lo^ about. The male stains much less deeply 

 and has more abundant nuclear matter. Quite young 



Fig. j6A. Upper figure : shewing the three kinds of ookinet and the three 



trypanosomes developed, from them in the mosquito's stomach. Lower 



figure : shewing the development of the indifferent trypanosomes into 



H. noctuae in the blood (after Schaudinn) 



forms consisting of a nuclear dot surrounded by a 

 little protoplasm also occur, and also a variety of stages 

 between these and full-grown adults. 



