76 



RHINOSPOKIDIUM 



the spirally coiled filament which is discharged and remains free in the 

 medium. It is 60 to 65 microns in length, and the nucleus of the cell 

 from which it was derived is still present 15 microns from one extremity. 

 The spores do not resemble those of any known microsporidian, for the 

 filament is not developed in a polar capsule, and is a much stouter structure 

 than those discharged from the spores of Microsporidiida. 



It will be evident that the parasites which have been considered under 

 the heading Haplosporidia form a very heterogeneous group. It seems 

 highly probable that some of them, at least, are really fungi. 



Rhinosporidium Minchin and Fantham, 1905. 

 Under this heading are included certain organisms which give rise to 

 polypi, especially in the nose, of human beings and horses. They are 



/■■ 



:!| 





A 1^ 



Fig. 335. — Section of Nasal Polyp from a Case of Infection with Bhino- 



sporidium seeberi (A, x 60; B, x 260). 



(Microjjhotographs of sections of tissues given to the writer by Professor J. H. Asliworth.) 



undoubtedly vegetable parasites, as conclusively demonstrated by Ash- 

 worth (1923), but they are considered here, as for a long time they were 

 regarded as Protozoa. Their structure and development appear to throw 

 light on the forms described above, the Protozoon affinities of which are 

 extremely doubtful. 



