40 salmonid.t;. 



The greatest depth of the body is below the origin of the dorsal 

 till, and i.s contained four times and a lialf in the total length (with- 

 out caudal), the length of the head four times and a quarter in the 

 same. The snout is obtuse, conical, and its length is contained 

 twice and a half in the postorbital length of the head ; the maxillary 

 bone is longer than the snout by two-thirds of the diameter of the 

 eye, and does not reach to the vertical from the hinder margin of 

 the eye ; the width of its broadest part is less than the diameter of 

 the eye. 



The dentition of the jaws and palate is perfect, the mandibulary, 

 intermaxillary, and palatine teeth being equal and much larger than 

 those of the maxillary. The vomer has the head triangailar, slightly 

 broader than long, and retains three teeth on its hinder margin : 

 there is also a series of teeth running along the longitudinal ridge, 

 these teeth being bent alternately to the right and left, but not dis- 

 posed in pairs. 



The distance of the nostrils from the eye is about half the dia- 

 meter of the latter ; the interorbital space is very slightly convex, 

 the eye being situated close to the upper profile of the head ; the 

 width of this space is one-eighth of an inch shorter than the maxil- 

 lary bone, and equal to the distance between the pupU and the angle 

 of the prajoperculum ; the prseopereulum has the hinder margin sub- 

 vertical, and the angle and lower limb roimded, the latter being per- 

 fectly distinct ; the posterior margin of the opercuhim is straight and 

 oblique, and placed at a right angle to its lower margin. A line 

 taken from the upper end of the gill-oi)ening to the point of junction 

 of the operculum and suboperculum is about one-sixteenth of an 

 inch longer than a line from the latter point to the lower anterior 

 end of the suboperculiun. 



The distance of the origin of the dorsal fin from the occiput, if car- 

 ried back from behind that fin, reaches to midway between the adipose 

 and the root of the caudal. The dorsal fin is a little higher than long, 

 and composed of fourteen rays, of which the first three are rudimen- 

 tary and enveloped in the skin, the fourth simple, shorter than the 

 fifth, which is the first branched ray and the longest of the fin. 



The anal fin is more than one- third higher than long, and con- 

 sists of eleven rays, of which the first is rudimentaiy and covered by 

 the skin, the second simple and half as long as the third, which is 

 also simple ; the fourth is the first branched ray and the longest of 

 the fin ; the last ray is cleft to the base. 



Pectoral longer than the length of the postorbital part of the head 

 by one-eighth of an inch : ventral shorter, its length being equal to 

 almost one-half of the distance of its root from the vent ; its outer 

 ray is on the vertical from the tenth of the dorsal fin. Caudal deeply 

 emarginate. 



There are 122 transverse series of scales, counted immediately 

 above the lateral line : the series descending obliquely backwards 

 from the origin of the dorsal fin to the lateral line contains about 

 twenty-seven scales ; that fi-om the adipose fin forwards to the lateral 

 line contains fourteen scales ; and there are about twenty-four longi- 



