GILLAROO. 61 



succession of generations. The common 

 trouts of this lake have stomachs like other 

 trouts, which never as far as my experience 

 has gone contain shell fish ; but of the gilla- 

 roo trout, I have caught with a fly some not 

 longer than my finger, which have had as 

 perfect a hard stomach as the larger ones, 

 with the coats as thick in proportion, and 

 the same shells within ; so that this animal is 

 at least now a distinct species, and is a sort 

 of link between the trout and char, which 

 has a stomach of the same kind with the 

 gillaroo, but not quite so thick, and which 

 feeds at the bottom in the same way. I have 

 often looked in the lakes abroad for gillaroo 

 trout, and never found one. In a large lake 

 at the foot of the Crest of the Brenner 

 above 4,000 feet above the level of the sea, 

 I once caught some trout, which, from their 

 thickness and red spots, I suspected were 

 gillaroo, but on opening the stomach I found 

 I was mistaken, it had no particular thick- 

 ness, and was filled with grasshoppers; but 

 there were char, which fed on shell fish, in 

 the same lake. 



