1. SALMO. 109 



inches. 



Girth of narrowest part of tail 4| 



Distance between the end of the snout and the eye . , If 



Length of the maxiUary bone li 



Distance between the eye and the angle of the prae- 



opercnlum If 



Greatest width of the operculum 1^ 



Greatest depth of the operculum If 



Distance between occiput and origin of dorsal fin . , 6i- 

 Distance between the end of dorsal and root of caudal 



fin 6| 



Length of base of the dorsal 24 



Greatest height of the dorsal 2f 



Length of the pectoral 3| 



Distance between root of pectoral and root of ventral Si- 

 Length of the ventral fin 2i 



Distance between root of ventral and origin of anal . 4^ 



Length of the anal fin 1|. 



Greatest depth of the anal 2i 



Length of the longest caudal ray 3f 



Length of the middle caudal ray iX 



This specimen is a female, 23 inches long, with the ova perfectly 

 developed, although the sexual organ is comparatively small. 



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

 and nearly one-fourth of the total (without caudal); the tail is rather 

 slender, its least depth being about one-third of the height of the body. 

 The length of the head is one-fourth of the total (without caudal); its 

 depth at the occiput equals the length of its postorbital portion ; the 

 snout is conical, rather jjointed, not quite twice as long as the eye, the 

 diameter of which is contained six times and one-third in the length 

 of the head. The maxiUary bone is longer than the snout, rather strong 

 in its basal portion, the width of its dilated portion being three-fifths 

 of that of the orbit ; it extends backwards to the vertical from the 

 posterior margin of the eye. Lower jaw moderately developed, with a 

 very inconspicuous knob in front. Dentition perfect ; the intermax- 

 illary teeth are the strongest, as strong as those on the tongue, of 

 which there are four pairs ; the head of the vomer is toothless, of sub- 

 pentagonal shape, lomjitudinally elongate, ivith the two lateral margins 

 longest; the body of the vomer is provided ivith a sharp lomjitiidinal 

 ridge, which bears some erect teeth, there being three on its anterior 

 portion, and one in the middle of its length. 



The interorbital space is convex, with the median longitudinal ridge 

 distinct, the eye being far below the upper profile of the head. The 

 posterior margin of the operculum and suboperculum is irregularly 

 semicircular, the posterior part of the curvature being considerably 

 more curved than the lower; the posterior point of junction of 

 operculum and suboperculum is a little nearer to the lower anterior 

 angle of the suboperculum than to the upper end of the gill-opening ; 

 operculum rather higher than mde ; the prceopercidum has a very 

 distinct inferior limb, which is more than half as long as the poste- 



