Eaferitls in Amative Animals, 447 



in more or less spherical niuLberiy groups, around masses of 

 endoplasm. That, here we have an invasion of the epithelia 

 there is little reason to doubt. Unfortunately no fully-developed 

 spores can be found, so that the mature stage of the parasite 

 remains unstudied. 



These parasitic protozoa affecting the intestines of different 

 Australian native animals appear to be of species hitherto unde- 

 scribed. 



Judging from the appearance and the situations^ especially, 

 probably four new species have been encountered. That they 

 can hardly be included with the Sarcosporidia, is evident from 

 their situation, and from their general structure. There is no 

 doubt that even the wallaby cysts have not their commencement 

 in muscle cells, for they, in the early stages, are seen to be quite 

 apart from any of the nmscle coats. The kangaroo large cysts 

 are probably within epithelial cells, while the smaller cysts are 

 definitely within mononuclear leucocytes. The wombat cysts 

 are undoubtedly in epithelial cells. The nature of the cysts is 

 in no case similar to the sarcosporidium. Each may, however, 

 l)e included in the same class Xeosporidid. 



REFERENCES. 



Chattou, E. Le Kyste de Gilruth — 



Archiv. de ZooL, exp. et generale, 1910, (5) Tome V., 

 Notes et Revue, No. 4, p. cxiv. a cxxiv. 

 Guiat, J. Parasitologie, p. 239. 

 Gilrutl), J. A. Notes on a Protozoon parasite found in the 



mucous membrane of the abdomen of a sheep. (Bull. Soc. 



Path, exot., t. III., p. 297,298, PL ii. 

 Lankester, Ray. Treatise on Zoology, Part I., p. 351. 



DESCRIPTION OF PLATES. 



Plate LXXII. 



Fig. 1. — Wallaby cyst. Almost mature stage, showing irre- 

 gularity of fringe and distortion of cyst with surround- 

 ing iuHauiinatory reaction and situation. (Drawn by 

 aid of camera lucida.) 



