70 SALMONID^. 



than one-fourth of that of the body. The snout is somewhat produced, 

 rather pointed, and more than half the length of the postorbital part 

 of the head. The length of the maxillary bone exceeds that of the 

 snout by three-fourths of the diameter of the eye, its greatest width 

 being more than half of the same. The lower jaw is slightly bent 

 upwards, -with a trace of a hook, and the contact of the upper and 

 lower jaws is imperfect. The teeth are strong, those of the mandible 

 and palatine bones being the strongest, the teeth on the vomer are 

 arranged in a double series, which, however, is much deranged in con- 

 sequence of about one-half of the teeth being in process of changing ; 

 four teeth stand in a transverse series on the hinder part of the head 

 of the vomer. 



The interorbital space is but slightly convex, and the eye is situ- 

 ated a little below the upper profile of the head ; the width of this 

 space is two-sevenths of the length of the head, and two-thirds of 

 that of the maxillary bone. The maxillary extends slightly beyond 

 the vertical from the hinder margin of the orbit. 



The prseoperculum has its hinder margin irregularly convex, and 

 considerably inclined backwards, scarcely any angle, and the lower 

 limb very indistinct. The hinder margin of the operculum is slightly 

 convex, very obhque, and forms a rather obtuse angle with the lower 

 margin, which is distinctly roimded. A line from the upper end of 

 the gill-opening to the angle of the operculum is equal to another 

 line from that point to the lower anterior end of the suboperculum. 

 Suboperculum twice as long as high. 



The dorsal fin is equally distant from the occiput and the root of 

 the caudal ; it is higher than long, and composed of thirteen rays, 

 the first two being rudimentary, and covered by the skin, the third 

 simple and a little shorter than the fourth, which is branched ; the 

 last is cleft to the base. 



The anal fin is about two-thirds as long as high, and consists of 

 twelve rays, the two anterior ones being rudimentary and covered 

 by the skin, the third simple and half as long as the fourth, which 

 i.^ also simple, and nearly as long as the next ; the last ray cleft to 

 the root. 



The pectoral fin is one -eighth of an inch longer than the post- 

 orbital part of the head. Its outer rays, towards their extremities, 

 show signs of some check having affected their growth. It is roimded, 

 and its length is less than one-half of its distance from the ventral 

 fin. The ventral fin is shorter than the pectoral, and reaches to 

 three-fourths of the distance of its root from the vent ; its outermost 

 ray is vertically opposite 1 o the tenth of the dorsal. Caudal truncated, 

 short, with the lobes rather obtuse. 



There are 127 transverse rows of scales, counted immediately above 

 the lateral line : the series descending obliquely backwards from the 

 origin of the dorsal fin to the lateral line has thirty-one scales ; that 

 from the hinder end of the adipose backwards to the lateral line has 

 sixteen scales : there are twenty-seven longitudinal series between 

 the lateral line and the root of the ventral fin. All the scales arc 

 rounded behind, without median ridge. 



