200 Transactions.— Zoology. 
10 lbs. to 20 Ibs. in weight, springing out of the water. These seemed also 
to be dark in colour as they rose to view in the air, leaping to a height of 
four or five feet. I may mention here that the previous night on visiting 
the beach I heard many trout splashing about and out of the water, so 
nightfall with its keener air did not put a stop to their gambols, or irrita- 
tion, whichever it might be. Returning towards the point where I had 
seen ths diseased six-pounder, I observed one with its tail-fin out of the 
water, belly up and head on the bottom, in shallow water, drifting ashore. 
Wading in I seized it by the tail and easily ran it out and laid it on the 
shingle. As.it was nearly dead I did not kill it, and in a few minutes it. 
‘succumbed. It was evidently the same trout that I had been watching 
half an hour before, as it had the identical fungus marks I had been ob- 
serving, and it weighed 7i lbs. The fish was a female trout, fat, but dark 
in colour, badly spotted on dorsal and all the other fins with fungus; the 
gills were full of it, and a tuft hung out of the right side of the mouth, 
while the back and sides had a number of distinct marks or patches, some 
appearing as if due to the mucous covering having been eaten away by the 
disease. The margin of right opercula and origin of right pectoral fin were 
also eaten away. Lying on the beach near the creek mouth I saw the 
skeletons of two other trout which had evidently come ashore after death. 
Examination of the Diseased Trout. 
The same evening, twelve hours after getting this trout, Dr. Douglas, of 
the Wakatipu Hospital, and I made an examination of it. Immediately 
after death it had visibly swelled, and continued to do so till the abdomen 
became very much distended—a thing which never occurs with healthy 
trout. On opening it we found it full of ova nearly ripe, the roe-lobes 
having a hard appearance ; pyloric ceca fatty, but not healthy ; stomach . 
quite empty, and air-bladder very much swollen with gas. The other 
viscera seemed healthy. A number of the blood-vessels lining the abdominal 
wall were full of coagulated blood, but that is not unusual. The teeth on 
body of vomer were gone and the gills were of a dull purplish hue. In 
attempting to remove a patch of fungus from the gills it could not be 
separated, so firmly had the roots taken hold, and the tissues came away 
easily with it. The gills, in fact, were rotting, 
A small portion of fungus 
and structure remarkably like Saprolignia ferax (figs. 1 and 2, pl. XXIII.), 
and, so far as I can judge, apparently the same disease ; but of that I can- 
not be positive. Plenty of long sacs full of 
£ spores and supported by 
No saes were seen in the protoplasm 
