134 THE ZOOLOGIST. 
Perhaps there are few families among fishes which can compete 
with the Salmonide in so rapidly developing change, and I was 
greatly interested in receiving the following examples from 
Mr. Frank Buckland, Mr. Carrington, of the Royal Westminster 
Aquarium, and other gentlemen who have most kindly sent me 
specimens, and which I exhibited at the last meeting of the 
Linnean Society. I wish at this time of the year to draw 
attention to the following facts, in order that anglers during the 
ensuing fishing season may be induced to carefully note any 
remarkable changes in form, scaling, or colours among the fishes 
they may be so skilful or fortunate as to capture or otherwise 
observe. 
The first example I will allude to is that of an American 
Trout or Charr (Salmo fontinalis) introduced into this country. 
The specimen is nine inches long, of good condition, and haying 
brilliant colours; it was reared by Mr. Buckland in his tanks at 
the Horticultural Gardens, at Kensington, from eggs received 
from Lake Huron. He presented some young to the authorities 
of the Westminster Aquarium soon after that institution was first 
opened, and the fish under consideration is the last which 
survived, having only died in October, 1879, due to having 
jumped out of its tank. Here there can be no question respecting 
the parentage of the fish—the eggs came direct from its native 
habitat, Lake Huron, in America; no crossing with European 
Trout could have occurred. It is not my purpose to detail the 
number of scales and fin rays in this place, but I will merely 
remark that they agree with what obtains in the normal Salmo 
fontinalis. A single glance at the fish, however, is sufficient to 
show that the head is very much elongated in proportion to 
the length of its body, and likewise that the very form of the 
subopercle has changed, being twice as long as deep, instead 
of square as observed in other examples reared under different 
conditions, I have likewise two specimens of this fish reared 
from eggs derived from the same source; they were turned out 
in Cardiganshire in 1876, and captured in the middle of the 
succeeding year; their entire length is similar to that of the 
Aquarium example, but the head is not elongated, the form of the 
subopercle remains unchanged. It seems to me that these facts 
are very suggestive; certain unnatural conditions have caused 
unnatural development of certain parts, and were other examples 
