58 SALMONID.'E. 



inches. 



Length of maxillarj- bono | 



Distance between eye and angle of iincoperciiluni .... 4 



Greatest width of opcrcnlum | 



Greatest depth of opercuhim a 



Distance between occiput and origin of dorsal fin ... . 1| 



Distance between end of dorsal and root of caudal . . 2| 



Length of base of dorsal | 



Greatest height of dorsal 1 



Length of pectoral 1| 



Distance between root of pectoral and root of ventral. . 2 



Length of ventral fin | 



Distance between root of ventral and origin of anal . . If 



Length of anal fin -j^ 



Greatest depth of anal f 



Length of longest cai;dal ray 1|- 



Length of middle caudal ray -j^^ 



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

 fin, and is one-fourth of the entire length (without caudal); the length 

 of the head is somewhat less. The snout is rather obtuse, and its 

 length is about half that of the postorbital portion of the head. The 

 length of the maxillaiy bone exceeds that of the snout by two-thirds 

 the diameter of the eye, its greatest width being about half of the 

 same. 



The dentition is perfect, the teeth of the intermaxillary and 

 mandible being larger than those of the maxillary and palatine 

 bones. Vomerine teeth strong, forming a single series, the teeth 

 being bent alternately towards the right and left. 



The interorbital space is much flattened above, and the eye is 

 situated immediately below the upper profile of the head : the width 

 of this space is nearly one-foiu-th of the length of the head, and 

 three-fifths of that of the maxillary bone. 



The praeoperculum has the posterior margin slightly convex and 

 almost vertical, the angle rounded and the lower limb rather feebly 

 developed; the hinder margin of the operculum is straight and 

 oblique, forming a right angle with, its lower limb. A line from the 

 upper end of the gill-opening to the opercular angle is only one- 

 sixteenth of an inch longer than another Une from that point to the 

 lower anterior angle of the suboperculum. 



The distance of the dorsal fin from the occiput, if carried back from 

 behind that fin, reaches only one-eighth of an inch beyond the adipose. 

 The dorsal fin is higher than long, and consists of fourteen rays, of 

 which the first three are rudimentary and covered by the skin, the 

 fourth simple and nearly as long as the fifth ; the last ray is cleft 

 to the base. The anal fin is higher than long, and composed of 

 twelve rays, of which the first three are rudimentary and covered by 

 the skin, the fourth simple, the fifth and sixth the longest of the 

 fin, and the last cleft to its base. The pectoral fin is much longer 

 than the space between the orbit and the opercular angle. Ventral 

 shorter than pectoral, reaching about two-thirds of the distance of 



