376 PARASITIC DISEASE IN BATRACHIA AND SALMONIDJE. 
In my recently published treatise I have sought to give 
expression to this fact, more particularly in relation to our 
ordinary domesticated animals. By-and-bye more significance 
will be attached to this matter by professional men, who, 
instead of rolling together a variety of parasitic affections 
and calling them by one name will demand some special 
nomenclature, such as I am desirous of introducing. Recently 
a human disease, which I believe to be strongylosis has been 
confounded with trichinosis, and, similarly, olulaniasis and 
psorospermosis have been confounded with trichinosis. We 
ifiust keep these and many other distinctive affections, such 
as anchylostomosis, widely apart. This brings me to notice 
the following remarkable instance of parasitism in one of 
the salmon trihe. 
On the 30th of April I received from Mr. Robert J. Simpson 
some interesting parasites, together with portions of the skin, 
gills, and muscles of a lake trout. The specimens were 
accompanied by a letter, written from Rothay Cottage, Am- 
bleside, only the day before, and in it Mr. Simpson records 
the following particulars : 
“On Tuesday last a dead Salmonferox was found in the 
river Brathay, a female fish, in good condition (for a spawned 
fish), twenty-four inches in length, four pounds in weight. 
The fish had evidently died from the salmon disease, though 
this is the first victim yet seen in the rivers running into 
Lake Windermere. On making a post-mortem examination 
I found the fish, I may say, one mass of parasites, all seem¬ 
ingly of one kind, and, from the egg, as minute as can be 
seen, to worms two inches long. One of the gills was dis¬ 
eased; the part I have cut off and enclosed in bottle. I also 
enclose a piece of skin that had the salmon disease ; also a 
lot of the parasite at its different stages of growth. To my 
surprise, in cutting into the flesh under the diseased skin, I 
found the parasite at fully one and a half to two inches at 
full length. I enclose one bit of skin and flesh with a large 
parasite in it. I hope you will be able to see it. When put 
into the spirit its white body was clearly seen, stretched at 
full length, in the pink flesh. On cutting into the flesh, 
and examining it more thoroughly, I found the whole flesh 
more or less alfected with the parasite, some at full length, 
others in cells curled up. I have not hitherto met with this 
parasite, nor have I had a specimen with the salmon disease 
to examine. I have not heard whether this parasite is 
common to fish killed by the disease. Do you know this 
parasite? Can it have anything to do with the disease? 
The cause of death did not appear clear, looking only at the 
