FISHES OF LAKE SUPERIOR. 275 



and strongly inclined backwards, not reaching the extremity of 

 the fin. The rays of the lower lobe do not differ from those of 

 the dorsal. They bifurcate like these latter, but at the extremity 

 only. The posterior margin of this lobe is notched, in the form 

 of a crescent and elongated in its upper part, along the arch of 

 the tail. The notch is not deep in the lower part. 



The anal is opposite to the dorsal, beyond which it extends 

 backwards. It is narrow, elongated, almost twice as high as it is 

 broad. The inner and outer margins are almost straight;, the 

 terminal oblique margin slightly curved. The rays are slender, 

 bifurcated at their extremity only. 



The ventrals, similar in their form to the anal, are situated at 

 the posterior third of the body. Their structure has nothing that 

 distinguishes them from the anal. 



The pectorals are as in the A. Icevis the largest of all the fins. 

 Their form is lengthened, the terminal margin is obliquely rounded, 

 and passes to the inner margin by an arch. The anterior and outer 

 margin bears a spinous ray, bent beyond its insertion, and curving 

 inwards a little before the point. It does not reach the extremity 

 of the fin. It is flattened in the horizontal diameter of the fin ; 

 its basis is three-sixteenths of an inch broad and terminates in an 

 obtuse point, in the margin of the fin. The surface is striated longi- 

 tudinally on both surfaces, alternating with small furrows and 

 wrinkles. The soft rays are as in the other fins. 



Tbe general color is of a yellowish brown on the upper half 

 of Jhe body, the yellow growing purer on the sides and beneath 

 the belly. A large spot of an intense black, and an elongated 

 quadrangular form occupies, on the middle of the back, the space 

 between the dorsal and lateral series of shields. A second pair 

 of large spots of the same color occupies the same position on 

 the sides of the dorsal fin, on which they even encroach a little. 

 Other small spots are distributed over the sides of the fish 

 from the opercular apparatus (itself included) to the tail and 

 the fins, giving thus to the whole fish a dotted appearance. 



P. 1, 43-35 ; V. 26-28 ; D. 36 ; A. 25-28. C. lower lobe 

 more than sixty. 



