THE H/EMOSPORIDIA 



385 



staining more deeply, on which the pseudopodia are centred ; and a smaller, 

 paler body placed more excentrically. In the pear-shaped forms the large, 

 dark nucleus is placed at the blunt end, the small, pale body near the pointed 

 end. Forms similar to these have been obtained in^cultures, and evidently 



jglp * 



^^V 



H 



FIG. 162. Stages in the development of Piroplasma in the tick. A 0, Amoeboid 

 forms (gametes ?) : A, pear-shaped, with the pseudopodia given off at the 

 thicker end of the body ; B, C, spherical or Heliozoon-like, with the pseudo- 

 podia radiating out on all sides ; D F, fusion of the gametes (?) ; 0, result 

 of fusion (?) ; H J, globular bodies (zygotes ?) ; K M, motile vermicules 

 (ookinetes ?). A J after Koch (P. bovis) ; K M, after Christophers 

 (P. cam's). _j 



represent the first stages of the development; but they appear to^havejbeen 

 missed by Christophers, unless it is to be assumed that these forms occur in 

 P. bovis, and not hi P. canis. i 



The star-like forms would appear to represent the gametes ; they congregate 



25 



