2 5 8 



specimens (marked No. 9) in my series of % parasites in this 

 Exhibition : 



On the 30th April, 1880, 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 

 Ambleside, only the day before, and in it Mr. Simpson 

 records the following particulars : 



" On Tuesday last a dead Salmo ferox 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 exami- 

 nation I found the fish, I may say, one mass of parasites, 

 all seemingly of one kind, and, from the egg, as minute as 

 can be seen, to worms two inches long. One of the gills 

 was diseased ; 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 in 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 

 affected 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 



