180 
meter. In each of these small cell areas is a very clear vesicular nucleus. 
In most sections of the cyst the contents appear to consist of nothing 
but these small crowded cells, and there is no peripheral zone of pro- 
liferating tissue such as is seen in Rhinosporidium. The only signs of 
nuclear division were such doubtful stages as that figured in figs. 2 and 4 
and these were excessively rare. There is little or no resemblance to 
any of the Haplosporidia described by Caullery and Mesnil and 
others. Onexamining certain of the sections it was found that there were 
patches (fig. 3) containing cells which differed from those above described. 
Such a cell is figured in fig. 5 and exhibits a nucleus resembling that of 
the cells first described, but this nucleus and the cytoplasm are seen to 
Fig. 1. Section of gill of Trutta fario showing position of cyst (a) and proliferation 
of epithelum at (0). X 62. 
be pushed to one side of the cell in order to make room for a large body 
or large bodies of doubtful significance. These cell inclusions stain 
deeply with Iron Haematoxylin, the centre being more deeply stained 
than the periphery. Exactly similar cells have been described by 
Pérez (3 and 4) and Moral (2) from cysts found in the skin of Newts, 
Triton cristatus and T. marmoratus, while Pérez (4) mentions that 
Professor Léger has seen a similar parasite on the gills of Trutta fario 
in the Dauphiné. Pérez has described and figured the second kind of 
cell (fig. 5) alluded to above so well, that I can add nothing to his 
description, and I have nothing to add to his and Moral’s (2) descrip- 
tion of the peculiar cell inclusion. Neither Pérez nor Moral however, 
described any other type of cell than those containing the large in- 
