436 J. A. Gilruth and L. B. Bull : 



in this manner fully-developed spores are formed, these being 

 crowded together within the enlarged blastophore (Plate LXXV., 

 Fig. 7), but still in most cases grouped radially around a varying 

 quantity of residual protoplasm. In some sections free spores 

 may be seen exterior to the cysts, these having escaped through 

 the now thin and ruptured envelope. 



Degeneration of the Blastophores. 



What is apparently a degeneration of some of the blasto- 

 phores is of frequent occurrence, for in all stages of development 

 of the cysts one or moro spaces may be seen which correspond 

 to the blastophores, but are generally much larger and usually 

 situated at or near the centre of the cyst. These spaces contain 

 a loose basophile granular material, evidently the chromatin of 

 broken-down nuclei. Different phases of the nuclear disinte- 

 gration may be seen in various cysts. 



Mature spores. 



These are best examined in smears prepared by squeezing the 

 contents of the cysts between a coverglass and slide, fixing in 

 alcohol, and staining by giemsa or iron haematoxylin and eosin. 

 Spores thus fixed and stained are found to be ovoid or falci- 

 form bodies narrowing towards one end, and nieasuiing 7.3yu, 

 to 12.4/x long by 3.4/x to 4.9/x broad. A large nucleus 

 situated rather nearer the narrower extremity than the centre. 

 In no instance does the nucleus stain deeply, and often it is less 

 definitely stained than the cytoplasm, appearing as a somewhat 

 clear ovoid space of nearly the same diameter as the spore. 

 Scattered throughout the cytoplasm are numerous granules 

 situated chiefly towards the blunter and broader end. 



Tleocystis macropodis and Lymphocystis macropodis 

 in Kangaroo (Macropus sp.). 



The infection has been observed in only one specimen, a 

 young, half-grown kangaroo, which died a few days after arrival 



