136 NATURAL HISTORY OF ARCTIC AMERICA. 



dorsal fin. The greatest width of the head is a little less than half its 

 length. The distance Ijetween the eyes equals their long diameter and 

 half the length of the mandible. The length of the snout equals half 

 the length of the middle caudal rays. The length of the operculum 

 equals the distance between the eyes. The length of the upper jaw is 

 contained from 10 to 11 times in total length without caudal, and the 

 length of the mandible 7;^ times. The distance from the snout to the 

 orbit is ^ or nearly ^ of the distance from the same point to the base of 

 the pectoral. The long diameter of the eye equals ^ of the greatest 

 height of the body. The teeth are arranged just as in the specimens 

 examined and described by Dr. Giinther. 



The distance of the first dorsal from the tip of the snout equals ^ of 

 the distance of the anal from the same point, and is contained 25 times 

 in total length without caudal. The length of the base of the first dorsal 

 is contained 8-} to 9 times in total length without caudal, and of its 

 longest ray, 7 times. 



The adipose dorsal is placed at a distance from the tip of the snout, 

 equal to -^- of the total length, exclusive of the caudal. Its height about 

 equals the distance from the snout to the orbit. 



The distance of the anal from the snout equals -J- of the total length as 

 before measured. The length of the anal base equals half the length of 

 the head in the larger female, and -■^\- of total length in the smaller. 

 The longest ray of the anal equals twice the distance between the eyes, 

 and the last ray equals half the length of the base of the first dorsal. 



The length of the midle caudal rays is contained 2^ times in the length 

 of the external rays and 12i times in total length. 



The distance from the tip of the snout to tlio l)ase of tlie ])octoral 

 e(|iials twice tlu' greatest AAidth of the head. T\w lengtli of the pectoral 

 equals the distance from the snout to the nape. The fin when extended 

 falls short of the vertical through the origin of the first dorsal by about 

 oiH -third of its own length. 



The distance of the ventral from the tip of the snout equals 3 times 

 tho length of the pectoral. The length of the ventral equals J^ of total 

 length. The ventral terminates at a distance from the vent equal to tho 

 least height of the caudal peduncle. 



UmlialfonnuJv.—B. 10? to 11? ; D. 13; A. 11: \\ 1.". to IC : V. 1, !>. 



Ccrcrt pj/lorica. — In the larger female, 28. 



The coloration rannot be made out accurately. There are a few small 

 spots oil the side of the body, which mow appear while. Parr marks are 



