Enteritis in Native Animals. 433 



mortem examination was made a few hours after death, extensive 

 bacterial invasion of the intestinal coats was very definite. It 

 may be that more extended investigation of further cases will 

 demonstrate that these parasites which at present appear to be 

 of four distinct species, possibly a new genus, are but the one 

 species varying according to the animal and according to the 

 cells invaded. The terms applied to these protozoa in this article 

 are therefore naturally provisional, and in the absence of full 

 knowledge of their life history are only employed to avoid con- 

 fusion and repetition in future references. 



So far as we are aware, such parasites have not previously 

 been recorded, though that referred to as Sarcocystis mucosa, 

 Blanchard, by Eay Lankester (Treatise on Zoology, Part I., p. 

 351), and by Guiart (Parasitologic, p. 239), who includes it with 

 the sub-genus Balhiariia, may prove on consulting Blanchard's 

 original memoir, which at present is not available, to be the 

 same as one or other of the forms we describe. 



Sarcocystis macropodis from Wallaby (Petrogale sp.). 



The protozoan infection has been observed in three animals. 

 In two cases the immediate cause of death was acute enteritis, 

 affecting the greater part of the small intestine in each, the 

 parasitic cyst being confined to the inflamed portions, and pre- 

 sent in enormo'us numbers, but in the other specimen there was 

 no acute inflammation, while the cysts were very few in number, 

 not more than a dozen being present in the whole of the 

 intestinal wall. In this note those manifesting the acute ente- 

 ritis are alone dealt with. 



On post-mortem examination the whole of the small intestine 

 was observed to be mottled with irregular areas of deep conges- 

 tion, visible from the serous surface. On closer examination 

 these areas were seen to be composed of groups of fairly regular 

 circular nodules with pale centre surrounded by a deeply con- 

 gested periphery. The whole mucosa-on incision was found to be 

 catarrhal and deeply congested, especially around and above the 

 small nodules, which distinctly projected into the lumen as dark 

 red elevations each about the average size of a grain of mustard. 

 The stomach and large intestines were normal, as were the other 



