THE PIKE PERCH. 225 



the last two rays 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 

 part has one flat spine, beyond which there is a pointed 

 membrane, 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. 7 ; D. 13.2.20 ; P. 10 ; V. 1.5 ; A. 1.14 ; 0. 17f. 



But according to Dr. De Kay they are — 



Br! 7 ; D. 13.1.21 ; P. 15 ; V. 1.5 ; A. 1.14 ; C. 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 differences 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* 



