682 THE H^MATOZOA OF AUSTRALIAN REPTILIA, I. 



from the surface of the red cell, while the posterior half with the 

 nucleus still remained within. The tail was now straightened 

 instead of being bent on the body, and the parasite presented the 

 typical form of a narrow, elongated, slightly curved body whose 

 ends tapered gradually and fairly equally, and showed its well 

 marked nucleus and deeply stained blue granules. The 

 "capsular area" formerly occupied by the parasite in its host- 

 cell was readily distinguishable, as the accompanying camera- 

 lucida sketch shows. 



The type-slide of Hiemoyregarina {Karyolysus) dendrophidis 

 has been depo.sited in the Australian Museum, Sydney. 



HiEMOGREGAHiNA (Karyolysus), sj)., from Diemeiiia psatnmophis 



var. reticidata Krefft. 



(Plate XX., figs.9-12.) 



Blood-films taken by one of us, 1907, from a " spinifex-sn;dce " 

 {Diemenia psatnmophis var. reticulata Krefft) in the north-west 

 of West Australian, were seen, on examination, to contain abund- 

 ance of heemogregarines in the red corpuscles. The preservation 

 was imperfect, and consequently only an incomplete account can 

 be given. The parasites were relatively large, being from 014 

 to 0016 ram. long, by about 0-004 mm. broad. They were fairly 

 uniform in size and shape, being mostly kidney-form, the con- 

 cavity closely approaching the nucleus of the host-cell. The ends 

 were generally broad and rounded, and of abont the same size, 

 though in some cases one end was rather narrower than the other. 

 In a few forms there was a slight bulging near the midregion, 

 and it was here that the band-like nucleus, when recognisable, 

 was seen to be situated. Some of the organisms showed the 

 presence of a small "tail" bent round upon the "body," but 

 very little detail could be recognised. A capsule was detected in 

 a few instances. Most of the infected cells were scarcely, if at 

 all, enlarged, and their nuclei were usually only slightly displaced, 

 even by parasites occupying nearly half the erythrocyte. In some 

 cases the nucleus was seen to be pushed over to the edge of the 

 red cell, and in a few instances was not present at all, having 



