BY T. HARVEY JOHNSTON AND J. BURTON CLELAND. 683 



probably been ejected. Double infection of a cell appeared to be 

 rare. In one case noticed the parasites were large adults, and 

 there was scarcely any space left unoccupied in the extranuclear 

 protoplasm of the host. The nucleus was here pushed to one 

 side, but did not show any signs of degeneration. 



Films from this snake were sent to Professor Minchin for 

 examination. 



H.EMOGREGARINA (KarYOLYSUS) VARANICOLA, n.sp. 



(Plate XX., figs.13-16.) 



Blood-smears taken by Mr. Allan McCulloch, of the Austra- 

 lian Museum, from a monitor lizard, Varanus varius Shaw, shot 

 by him near Bingara, New South Wales, in December, 1909, 

 were examined by us, and the presence of a few hsemogregarines 

 in the erythrocytes was revealed. 



The parasites were relatively larije, the more or less rounded 

 forms being 0-0135 mm. long, by about 0004 mm broad. "Tailed" 

 forms, measured along the middle, ^vere from 0'0167 to 0-018 mm. 

 long, by 0003 to 0-004 mm. in maximum breadth. A few 

 resembled crescents with broad rounded ends, the concavity 

 facing: the nucleus in some instances but remote from it in others. 

 Usually the central portion of the coucave face was considerably 

 swollen to form the broadest part of the ha?mogregarine. In a 

 few forms the parasite posse.ssed a broad end (regarded as 

 anterior), the other gradually narrowing to terminate in a fairly 

 wide " tail " with a rounded extremity. This tail was bent round 

 to lie in almost the same direction as the " body." The nucleus 

 was either a broad band or a more or less rounded structure 

 lying towards one end, in the case of tailed forms, the position 

 being at about the point where the " tail " commenced to bend 

 round. Some of these sporozoa showed the presence of a well- 

 marked capsule, this being easily seen in the tailed forms, a 

 distinct space being recognizable Ijetween the " tail '' and the 

 " body." Neither free nor segmenting stages were recognised. 



In none of the infected cells was any distortion of form seen, 

 though in all cases the host-nucleus was displaced from its normal 



