494 



TELOSPORIDIA 



in the neighbourhood of the two small chromatin masses, which they carry 

 with them. 



The processes enlarge at the expense of the rest of the cytoplasm, and the 

 vacuole divides, and the so-called trefoil stage is reached, in which the main 

 mass of the chromatin, much reduced in size, lies at the base of the two 

 processes. 



Fig. 163. — Diagram of the Life-Cycles of Piroplasma canis. 



(After Nuttall and Graham-Smith, Christophers, and Breinl and Kinghorn.) 



1-1 2x, Reproduction by simple division; a-a, reproduction by multiple 

 division; A-F, development of a flagellate form; 12^-25, sporogony in the 

 tick . 



The single strand connecting the two smaller chromatin particles has 

 shortened and disappeared, so that the strand of each small mass now rises 

 directly from the principal chromatin mass. This now divides into two 

 nuclei, connected by a strand, while the cytoplasmic processes become large. 

 Finally, the cytoplasm divides, and two pyriform parasites are found lying 

 sideby side in one corpuscle, an arrangement considered typical of a piroplasma. 



In each parasite is a vacuole, and a principal chromatic nucleus situated 



