THE PIKE PERCH. 225 
the last two rajs of the first dorsal jet black, whereas 
that attached to the other rays is yellow. The lower 
edge of the gill-cover has been described as smooth, but 
I find the fore part of it slightly serrated ; the posterior 
j)art has one fiat spine, beyond which there is a pointed 
rnembrane, and above a rudimentary spine. There is a 
series of sharp teeth on both jaws and the gill-arches, 
two in the front of each jaw being long and conspicuous. 
The base of the tongue is roughened but toothless, and I 
can find no teeth on the vomer. The scales are not large, 
and have the edges marked out by a series of dots. 
The fins, as I make them, are — 
Br. T ; D. 13.2.20 ; P. 10 ; Y. 1.5 ; A. 1.14 ; C. 17|. 
But according to Dr. De Kay they are — 
Br. 7 ; D. 13.1.21 ; P. 15 ; Y. 1.5 ; A. 1.14 ; O. 17f . 
The color of the anal is reddish yellow ; of the ven- 
trals light yellow, and pectorals yellowish olive. There 
are scales on the gill-covers ; those on the fore gill-cover 
being scattered and few. Beyond these diff'erences my 
examination found the ordinary pike of the lakes to ac- 
cord with the description of Dr. De Kay ; but the other 
species that I have mentioned was very different both in 
color and appearance, and is, as I conceive, the true 
Ohio salmon, a name that has been applied to the spe- 
cies just described. 
As for the color in the latter species, that was totally 
different, being so far like the salmon as to have no 
doubt given origin to the name. It is bluish grey on 
the back, greyer on the sides, and white on the abdomen. 
The only part of membrane of the dorsal of the salmon 
that is black is that attached to the last spine alone of 
10* 
