5o8 



TELOSPORIDIA 



certain of the genera of the Anophelinae sucks the blood of a 

 person in whom both macro- and micro-gametocytes are to be 

 found, a new cycle is started in that mosquito. This cycle is 

 sporogony, which is characterized by being a sexual process. 

 Changes now appear in the macro- and micro -gametocyte, Which 

 are thought by Schaudinn to be brought about by the alteration in 

 temperature. 



The macrogametocyte, escaping from its red cell, undergoes 

 reduction by division of its nucleus once or twice, forming polar 

 bodies. The reduced gametocyte is now called the macrogamete. 



Similarly the microgametocyte Undergoes changes, for chromidial 

 masses separate from its nucleus and travel to the periphery of 

 the parasite, from which thin threads of protoplasm now project. 



\ 



Fig. i68. — Sporocysts in Stomach of Anopheline Mosquito. (X i,ooo 



Diameters.) 



(By Norman, from a preparation by James.) 



These threads, which vary from four to six in number, lash about 

 vigorously, moving the Whole parasite, which therefore whirls about, 

 and it and its processes, called flagella, were looked upon as a 

 polymitus; hence this stage is often called the polymitus stage. 



The threads break off, and are now called microgametes. Each 

 microgamete is composed of a long, tapering thread of protoplasm 

 capable of bending and moving rapidly. Its chromatin is spread 

 along it in dots or bars, and hence the whole structure somewhat 

 resembles a spirochaete, but there is no undulating membrane. 



A microgamete now conjugates with a macrogamete, the male 



