4S8 THE HiEMATOZOA OP AUSTRALIAN REPTILIA, II., 



observed in different species of Varanus, from various parts 

 of Africa, and from India (Simond, 1901; Laveran, 1905; 

 Nicolle and Comte, 1906 ; Bouet, 1909 ; Laveran and Petit, 

 1909; Franca, 1910, p. 203). 



HiEMOGREGARINA (KaRYOLYSUS) GOULDII, n.sp. 



(Plate xvi., figs. 1-10.) 



The hsemogregarines present in films taken from two speci- 

 mens of Varanus gouldii by Dr. Bancroft (Burnett River, 

 October, 1910; March, 1911), appear to us to differ from 

 those found in Varanus varius in the same district, and at 

 the same time of the year. The parasite has a more detri- 

 mental effect on the host-cell than H. varanicola appears to 

 have. In practically all cases, the nucleus of the infected 

 erythrocyte was seen to be considerably elongated, the haema- 

 tozoon, as a rule, either lying close beside it or else overlying 

 it. Sometimes a certain amount of dehaemoglobinisation and 

 generally more or less elongation of the host-cell occurred. In 

 greatly distorted erythrocytes, little or no hsemoglobin re- 

 mained, the host-protoplasm being very thin. A capsule, 

 when recognised, was seen to surround the parasite very 

 closely. 



Most of the hsemogregarines were rather thin, elongate 

 bodies (about 20 x 2-5 jj) investing the host-nucleus some- 

 what as a Halteridium does. In these forms, the nucleus 

 was dense and deeply staining ; and, in addition, there was 

 usually an abundance of small chromatic granules dispersed 

 throughout the protoplasm. A second type of organism was 

 also present, the body being broader and more plump(10-8-17/x 

 long, X 5-7 /x broad), and the nuclear matter rather more 

 dispersed and less deeply staining. Besides, the protoplasm 

 stained very lightly, being vacuolate. Chromatic specks were 

 usually not so abundant, and frequently were absent. These 

 two types may represent the sexual forms referred to by 

 Prowazek (1907, p. 32). 



