484 THE H^MATOZOA OF AUSTRALIAN REPTILIA, II., 



some of the specimens. The nucleus was very varied in form 

 and position. In young members, it appeared as a dense, 

 deeply staining mass lying medially. In others, the chro- 

 matic material was more or less irregularly aggregated near 

 the middle, but usually just behind it. Sometimes the form 

 was distinctly bandlike, while frequently the chromatin was 

 dispersed peripherally, no nuclear substance being detected 

 in the hind-region of the parasite. A horseshoe-shaped nuc- 

 leus was not uncommon. In all except quite young forms, a 

 distinct capsule was present. It usually invested the hsemo- 

 gregarine very closely, but occasionally there was a moderate 

 interval between them. 



The parasite occupied various situations in the host-cell, 

 but, in nearly all cases, its general position was parallel to 

 the longitudinal axis of the erythrocyte, the host-nucleus 

 lying between the end of the parasite and the end of the 

 cell. Sometimes the host-nucleus lay between the parasite 

 and the side of the cell. Occasionally the hsemogregarine was 

 situated transversely in the red blood-cell. In regard to the 

 effect on the red coi^puscle, in addition to the nuclear dis- 

 placement just referred to, which usiiallv takes place, there is 

 generally a slight increase in the size of the host-cell. How- 

 ever, the influence of the parasite does not seem to be con- 

 siderable, when compared with what may happen in the case 

 of certain other reptilian hsemogregarines. 



A typical slide containing Hcemogregarina clelandi and 

 Trypanosoma chelodina from Emydura krefftii, has been 

 deposited in the Australian Museum, Sydney. 



H^EMOGREGARINA TILIQU^, n.sp. 



(Plate XV., figs. 6-15.) 



In a specimen of Tiliqua scincoides, obtained near Sydney, 

 in October, 1910, haemogregarines were fairly numerous in 

 the red cells. The adult parasites exhibited the usual hsemo- 

 gregarine form with one end broad, narrowing thence to- 



