SPUROZOON PARASITES OF QUEENSLAMD FRESHWATER FISH. 525 
these cysts lying transversely, i.e. at right angles to the 
long axis of the filament. The spores are arranged with 
long axes parallel to that of the cyst. Infection was 
observed in eight out of thirteen specimens of bream, but 
only in one case was it at all severe. 
The spore is extremely like that of the preceding, but is 
slightly smaller while the tail is longer in proportion. The 
average dimensions are:—Length of spore 10 —14y; breadth 
of spore 2°>-—3p; thickness of spore 34; length of polar 
capsule 5—6y; breadth of polar capsule 1—2y; length of 
tail process about 20 — 26p, 
In order to obtain additional evidence, either for or 
against the view that two distinct species were being dealt 
with, a fairly large number of spores, taken at random, 
were drawn with the aid of a camera lucida, and measure- 
ments made thereof. The dimensions noted were, length 
and breadth of spore, and length of polar capsule. 
The average dimensions founded on these measurements 
Were. 
- Length of 
Species. Length of spore| Breadth of spore polar oanenie. 
Hf, gracilis 11°38 2°74 D°22u 
Hi. australis Tole 3°68 5°66 
The results of plotting the lengths measured against the 
number of spores in each case are given below. The 
empirical mode in the case of H. gracilis will be seen to be 
11, and in the case of H. australis 13. There was not. 
sufficient variation in the other dimensions to render a 
graphical representation of any value. 
Auerbach (1910, pp. 183 — 186) has recorded 18 species of 
Henneguya, from fish, two of which were undescribed. The 
various species inhabit almost every organ of the body but 
are rather more usually found in the ovary, gills and con- 
nective tissue. 
