240 
MALACOPTERYGII. CLUPEAD^. 
the tube. A dim circle of light is thus shed upon 
the bed of the stream, when the Trout, attracted 
by the light, crowd around the globe as moths 
around a candle. The fisherman then slowly 
raises the lamp, which the fish follow, towards the 
surface. He can now select the finest fish at his 
leisure, which he strikes with a well-directed blow 
on the head with his heavy knife. The fish 
instantly sinks to the bottom, but it is only for a 
moment, for it presently rises to the surface 
bloody and dead, and, floating there, is presently 
deposited in a bag hung round the operator's neck. 
The other fishes, alarmed for the moment, are 
soon attracted again, and become successively the 
prey of the fisherman, until his desires are satis- 
fied. 
Family V. Clupead^. 
{Herrings.) 
In most of their characteristics the Herrings 
agree with the Salmons ; and so close is the affinity 
between the two Families that the members of 
the Salmonidan genus Coregonus, the Pollans and 
Powans of our lakes, are called by the peasantry, 
both in this country and Ireland, the Freshwater 
Herrings. The same graceful form, curved in 
gently swelling outlines, and tapering to a point 
at each extremity, characterizes this Family, as 
the preceding ; and like it the present is clothed 
in large, well-formed scales, very easily detached. 
Their chief distinction is the absence of the 
adipose fin in the Herrings, which have only a 
single dorsal of the ordinary structure, placed 
