98 SALMONID^. 



inches. 



Greatest height of dorsal IJ- 



Length of pectoral 1|- 



Distance hetween root of pectoral and root of ventral 3 



Length of ventral fin 1^- 



Distance between root of ventral and origin of anal . . 2-1- 



Length of anal fin 1 



Greatest depth of anal 1\ 



Length of longest caudal ray lA 



Length of shortest caudal ray |- 



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

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

 length of the head being two-ninths of the same. 



The snout is rather short, conical, and less than half the length 

 of the postorbital portion of the head ; the length of the maxillary 

 bone is equal to that of the snout together with the entire diameter 

 of the eye, its greatest width is one-half of that diameter, the eye 

 being small in this species as compared with its congeners ; the jaws 

 are very feeble. 



Dentition rather feeble, the intermaxillary and palatine teeth 

 being equal in size and much smaller than those of the mandible ; 

 the vomerine teeth form a single or partly zigzag series. 



The interorbital space is rather convex, with an elevated median 

 ridge, and the eye but slightly below the upper profile of the head ; 

 the width of this space is equal to half the length of the postorbital 

 region of the head, or about three-fifths of that of the maxillary 

 bone. 



The posterior margin of the prseoperculum is convex, the angle 

 rounded, and the lower limb indistinct ; the posterior margin of the 

 operculum is straight, oblique, and forms a right angle with the 

 lower limb ; the distance from the upper end of the gill-opening to 

 the angle of the operculum exceeds that from the latter point to the 

 lower anterior end of the suboperculiun : suboperculum more than 

 twice as long as broad. 



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

 measured back from behind that fin, reaches to one-third of the 

 distance between the adipose and the root of the caudal. The dorsal 

 fin is as long as high, and is composed of foiu'teen rays, the first 

 three of which are rudimentary, the fourth simple and shorter than 

 the fifth, which is branched and the longest ray of the fin ; the last 

 ray is cleft to its root. 



The anal fin is foiu'-fifths as long as high, and possesses twelve 

 rays, the fij'st and second being rudimentary, the third simple and 

 somewhat shorter than the following, which is branched ; the fifth 

 is the longest of the fin, and the terminal ray is cleft throughout. 



The pectoral fin is three-eighths of an inch longer than the post- 

 orbital portion of the head, and rather more than one-half of the 

 distance of its root fi-om that of the ventral fin : the latter fin is 

 more than one-half as long as the distance of its root from the vent ; 

 its outer ray is in the vertical from the tenth of the dorsal fin. 



