1. SALMO. 75 



inches. 



Length of pectoral '. If 



Distance between root of pectoral and root of ventral 3^^ 



Length of ventral fin 1^ 



Distance between root of ventral and origin of anal . . 2^ 



Length of anal fin 1^ 



Greatest depth of anal • If 



Length of longest caudal ray If 



Length of middle caudal ray 1^;^ 



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

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

 of the head is one-fourth of the same. The snout is slightly pro- 

 duced, rather obtuse, and about half the length of the postorbital 

 portion 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 half the same. The lower jaw is straight, without book, 

 and the mouth closes perfectly. 



The dentition is perfect; the teeth of the maxillary bones are 

 smaller than those of the intermaxillary, palatines, and mandible. 

 The teeth on the vomer are disposed in an almost completely double 

 series. The interorbital space is rather flattened, the eye being 

 placed very slightly below the upper profile of the head ; the width 

 of this space is one-half the length of the postorbital portion of the 

 head, and more than two-thirds of that of the maxillary bone. The 

 maxillary bone extends slightly beyond the vertical from the posterior 

 margin of the eye. 



The hinder margin of the praoperculum is sHghtly convex, the 

 lower one not very distinct. The hinder margin of the operculum is 

 almost straight, very oblique, and forms a right angle with the lower 

 limb. The distance from the upper end of the gill-opening to the 

 opercular angle is equal to that from the latter point to the lower 

 anterior end of the suboperculum. Suboperculum rather more than 

 twice as long as high. 



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

 from behind that fin, reaches to midway between the adipose and 

 the root of the caudal. The length of the dorsal fin is nearly equal 

 to its height. It consists of fourteen rays, the first three of which 

 are i-udimentary and covered by skin, the fourth simple and much 

 shorter than the next, which is branched > the last ray cleft to the 

 root. 



The ana fin is higher than long, and composed of eleven rays, the 

 first three being covered by skin, the fourth simple and not much 

 shorter than the fifth ; the last ray cleft throughout. The pectoral 

 fin is a quarter of an inch longer than the postorbital portion of the 

 head, reaching about half of the distance of its root from the ventral. 

 The ventral fin is shorter ; its length is more than half of the distance 

 of its root from the vent : its outermost ray is vertically opposite to 

 the tenth of the dorsal fin. Caudal truncated. 



There are 117 transverse series of scales, counted immediately 

 above the lateral line ; the series descending obliquely backward 



