1. SALMO, 51 



Description of a Female Hybrid specimen from the Rhymiuy, captured 

 in the month of October, with mature eggs. 



inches. 



Total length 11^ 



Greatest depth of the body 3| 



Length of the head 4 



Girth of biggest part of the body 9| 



Least depth of tail 1| 



Girth of narrowest part of tail 4 



Distance between end of snout and eye l^- 



Length of maxiUary bone l|- 



Distance between eye and angle of prseoperculum . . 1|^ 



Greatest width of operculum ^ 



Greatest depth of operculum 1^ 



Distance between occiput and origin of dorsal fin ... . 5| 



Distance between end of dorsal and root of caudal . . 7 



Length of base of dorsal 2^ 



Greatest height of dorsal 1-L^ 



Length of pectoral 2f 



Distance between root of pectoral and root of ventral 5^ 



Length of ventral fin 2 



Distance between root of ventral and origin of anal . . 3| 



Length of anal fin 1| 



Greatest depth of anal 2| 



Length of longest caudal ray 2| 



Length of middle caudal ray If 



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

 fin, and contained four times and three-fourths in the total length 

 (without caudal), the length of the head four times and one-half in 

 the same. The snout is moderately produced, somewhat pointed, 

 and is nearly one-half the length of the postorbital part of the head. 

 The leng-th of the maxillary bone exceeds that of the snout by about 

 two-thirds of the diameter of the eye, and its greatest width is a httle 

 more than one-half of the same. 



The mandibulary and intermaxUlary teeth are equal and larger 

 than those of the maxillary and palatine bones. The head of the 

 vomer is triangular, twice as broad as long ; those of the vomerine 

 teeth which remain are confined to the longitudinal ridge, where 

 they are placed in pairs one behind the other, one of each pair 

 being bent to the right, the other to the left. There are four of 

 these pairs, the last being not far distant from the posterior ex- 

 tremity of the bone. 



The interorbital space is convex, the orbit being below the upper 

 profile of the head ; the width of this space is not much less than 

 the distance between the eye and the angle of the prceoperculum, and 

 one-fourth of an inch shorter than the maxillary bone. The pra3- 

 operculum has the hinder Hmb, angle, and lower margin rounded, the 

 inferior limb being distin-^.t. The hinder margin of the operculum is 

 almost straight, and forms a right angle with its lower limb. If a 



K 2 



