The Lamprey 263 
tion of this formidable mouth). The outer part of the mouth 
is encircled by a strong band of skin, and the whole forms a most 
perfect sucker, by means of which the lamprey attaches itself to 
some stone or fish. If the latter, then it runs a great risk 
of losing its life. The lamprey once fixed to its prey, begins its 
deadly quest; the outer strong edge remains stationary, whilst the 
teeth commence to move and cut up the flesh, and ultimately gouge 
out a deep hole in its victim. The salmon appears to be a favourite 
with the lamprey, judging by the number that have come under 
my notice marked in this fashion. Fig. 238 shows a sea-trout 
marked by a lamprey. Occasionally they are brought ashore by 
the nets, firmly fixed to a salmon, and only desist when they see 
they run the risk of being caught. I feel sure that many salmon 
are killed by the wounds inflicted by this gnawing creature. 
