408 ox SOME H^MOGREGARINES FROM AUSTRALIAN REPTILES, 



such a direction that the nucleus came to lie at or near one end, 

 instead of laterally. The infected cells were distorted along the 

 axes, hence their shape was not much altered, though their size 

 was considerably increased. 



Each adult parasite possessed a veiy definite, wide capsule, 

 generally elliptical in shape. There w^as a comparatively wide 

 interval between it and the organism. The outline of the latter 

 was much more regular than is usually the case in members of 

 the genus, the parasites being rather plump. In only one 

 instance, a short recurved " tail " was seen, lying close against 

 the rest of the " body." 



Many free forms were present in the plasma; but since they 

 were encapsuled, and were generally adjacent to crushed nuclei, 

 we may assume that the condition was produced in making the 

 film. The leucoc5^tes were not infected. 



The name Hcemogregarina clelandi is proposed for this species, 

 in recognition of Dr. Cleland's work on West Australian 

 parasitology. The type-slide has been presented to the Australian 

 Museum, Sydney. 



Other hsematozoa described from Australian tortoises are 

 Trypanosoma chelodina Johnson, (10) from Chelodina longicollis 

 Shaw, from Morgan, South Australia; and Hcemocystidum chelo- 

 dincB Johnston and Cleland,(9) from the same species, obtained 

 near Sydney 



As some authorities have stated that trypanosomes and haemo- 

 gregarines may be stages in the life-history of one organism, it will 

 not be out of place to mention the main characters given by Dr. 

 A. E. Johnson, of Adelaide, in his brief, unfigured account of 

 Trypanosoma chelodina, especially as it appears in a medical 

 journal which very probably may not be available to biologists 

 in other parts of the world. 



These parasites, which, in stained films, were bent in the form 

 of a semicircle, were larger than the nucleated discs, measuring 

 about 14/i long by lb fx wide; but, if the undulating membrane 

 were included, the breadth was from 2-5/i to 3^. The flagellum, 

 which was 2ju in length, was fringed, and ended at the centro- 



