13C 



SPOEOZOA. 



schizogony, producing the large merozoites, occurs free in the 

 blood-vessels of the lung, and that producing the smaller 

 gametocytes in the circulating red blood-corpuscles. In 

 H. stepanowi, on the other hand, schizogony always takes 

 place in the bone-marrow, always inside the blood-corpuscles, 

 and the number of merozoites does not exceed twenty-four. 



Christophers once showed Patton some bodies from a leech 

 off Lissemys punctata granosa which suggested developmental 

 forms of the Hsemogregarine of the tortoise, but Patton came 

 to the conclusion that they probably represented some stage 

 in the hfe-cycle of a Coccidium parasitic in the leech. 



Fig. 56. — Hsemogregarina nicorias Castellani & Willey. A, bean-shaped 

 Hsemogregarine, with circular type of nucleus ; B, early 

 stage of schizogony in the blood-stream ; G, late stage of 

 schizogony in the lung ; D, fully-formed merozoites, only 

 a very few of the total number formed shown in the section ; 



E, free motile stage in the lumen of the intestine of the leech ; 



F, microgametocyte lying closely applied to macrogameto- 

 cyte ; G, the microgametocyte giving rise to the micro- 

 gamete nuclei, one of which fuses with the nucleus of the 

 macrogamete ; H, sporocyst with eight nuclei; /, sporocyst 

 showing sporozoites. (After Robertson.) 



Habitat. — Blood of the tortoise Geoemyda trijuga (Schweiger) 

 and in the leech Ozobranchus shipleyi Harding : Ceylon, 

 Colombo ; blood of the tortoise Lissemys punctata granosa 

 (Schoepfif) and in the transmitting leech : Madras, Madras. 



