SPOROZ)ON PARASITES OF QUEENSLAND FRESHWATER FISH. 523- 
infection of the gall bladder was noticed, hence the per- 
centage infection may be much higher than it appears. 
This parasite was detected in four out of nine golden perch 
examined; in two cases in the kidney only, in one case only 
in the gall bladder; and one instance in both gall bladder 
and kidney. 
In sections of the kidney the cysts are found to lie in the 
connective tissue of the organ. They are exceedingly 
small, the following being the measurements of six taken 
at random :—’036 mm. in diameter; °024 x °048 mm.; °06 x 
"04 mm.; *076 x °072 mm. (shewn in microphotograph); °116. 
x°084 mm.; °144x*°1 mm. The two latter were relatively 
large cysts. No definite structure could be made out. The 
- spore is a rounded oval, and bears quite a close resemblance: 
to Myxobolus hylce, which we have recently described from 
the golden frog, Hyla aurea. It is, however, slightly 
shorter, the polar filaments are not so long, while the 
vacuole is apparently not iodinophilous. The average 
dimensions are:—Length of spore, 10-12»; breadth of 
spore 7—8y; length of polar capsule 54; breadth of polar 
capsule 2; length of polar filament 30—40y. 
Auerbach (pp. 39-44) records 28 species of Myxobolus: 
from fish, three of which are undescribed. They may occur 
in practically any organ of the body. Some are found in a 
great variety of situations within the same host, e.g. M. 
pfeifferi inhabits the intestines, spleen, ovary, muscles and 
neurilemma (?); whilst others like M. oculi-leucisci from 
the aqueous chamber of Leuciscus rutilus are apparently 
restricted to one organ. They have been rarely recorded 
from the gall bladder but commonly from the kidney. : 
HENNEGUYA AUSTRALIS Nn. Sp, 
Wigs. 4, 5, 11, 14, 16. 
Host:—The golden perch, Plectroplites ambiguus 
Richardson, 
