520 TELOSPORIDIA 



The Microgamete. — The microgamete is very thin, and tapering at the 

 posterior extremity, where it ends in a tail-like prolongation of the cytoplasm 

 containing a portion of the trophonucleus. The anterior end is acutely conical. 



The trophonucleus is elongated into a long thread, extending from the 

 anterior to the posterior end of the body, and carrying four chromosomes in 

 the form of dots at regular intervals. 



Fig. 178. — Hcemopfoteus Fig. 179.- — Hamoproteus noctucB Celli and 

 noctucB Celli AND San- Sanfelice: Maturation of the Ookinete. 

 FELICE: The Ookinete. 



(After Schaudinn.) _ 



The kinetonucleus is situate in the posterior third of the cytoplasm, and 

 consists of a rather elongated mass, with eight chromosomes and one intra- 

 nuclear centrosome. 



In addition to this centrosome there are two others: an anterior, situate 

 just at the base of the anterior conical projection, and a posterior, situate 

 just anterior to the tail, being connected with the trophonucleus by a chro- 

 matin bar. The undulating membrane runs from the anterior to the posterior 

 centrosome, and is strengthened by eight myonemes. 



Fig. 180. — Hcsmoproteus noctucB Celli and Sanfelice. 



(After Schaudinn.) 



Formation of the indifferent ookinete and its development into the 

 indifferent trypanosome. 



Formation of the Macrogamete. — The macrogametocyte becomes rounded 

 and ruptures the remains of the erythrocyte, and is set free. The centrosome 

 of the trophonucleus disappears, and the chromatin forms a spiral thread, 

 which separates by longitudinal and transverse divisions into four tetrads. 

 The kinetonucleus first forms a spindle, and then divides, causing the first 



