CHARLES BADHAM. 
showed about a hundred leeches in various stages of develop- 
ment, ranging in length from 1 to 13 mm. 
The parasites were found on the tins — pectoral, pelvic, dorsal, 
and caudal ; their presence was also noticed around ulcerated 
patches on the sides of the fish, and a few were found in the 
proximity of, but not on, the gills. 
Owing to their transparent nature, and the mucous secre- 
tions of the fish, they were not so readily visible as their 
highly pigmented form seen when magnified would suggest. 
On the occasion of the first visit in August I secured several 
hundred specimens, and in March of the following year, having 
determined to work out the anatomy and systematic position 
•of this leech, I again visited the Fish Hatcheries, but found 
that all the sand whiting had died. Dredging giving no 
results, arrangements were made to again place a number of 
the fish in the pond in order to obtain living specimens of 
the leech. 
Owing to an oversight, I was not informed of the state 
of these fish until all save one had died. This remaining fish 
was caught on June 8th, 1913, and was found but slightly 
infested. Most of the leeches obtained died in the first few 
days, but two hardy specimens were kept alive for three 
weeks, and these served for an extended intra vitam 
■examination, for taking photographs, and for making a 
coloured drawing. 
Owing to the transparent nature and small size of the 
leeches, the details of the Blood-vascular, Nephridial, and 
Doelomic systems could be followed, and this with only the 
Might compression of the leech produced by the pressure of 
u thin cover slip. 
A number of photographs of the living form were secured 
showing these systems in detail, and have been of value in 
this work. The pond in which these fish were kept under 
conditions which so favoured the increase of the leeches was 
a large one, being about 50 x 100 ft. The water in it varied 
in depth from 2 to 6 ft., and was changed by means of valves, 
the water being run off at low and replaced at high tide. 
