40 SALMONID^. 



tudin;tl series of scales between the lateral line and the base of the 

 ventral. Thi^ transverse series descending forwards from behind 

 the adipose tin to the lateral hne is composed of sixteen scales. All 

 the scales are obtusely rounded behind. 



Back greeuish-brown ; sides silvery ; belly dark brown ; scattered 

 black, X-shaped spots, irregularly distributed, and sometimes con- 

 fluent so as to form an iiTcgular small blotch, occupying the sides 

 above and below the lateral line. Fins immaculate, with a blackish 

 tinge. 



Description of an Adult Female specimen from the Rhymney, taken 

 ivith the male fish described. 



inches. 



Total length 22| 



Greatest depth of the body : 4|- 



Length of the head 4| 



Girth of the biggest part of the body 10| 



Least depth of the tail 1| 



Girth of the narrowest part of the tail 4^ 



Distance between the end of the snout and the eye . . 1-| 



Length of the maxillary bone 1J-|- 



Distance between the eye and the angle of the prae- 



operculum ll 



Greatest width of the operculum 1 



Greatest depth of the operculum 1|- 



Distance between occiput and origin of dorsal fin . . 6|- 



Distanee between end of dorsal and root of caudal fin 7| 



Leng-th of base of dorsal 2| 



Greatest height of dorsal 2 



Length of pectoral 2| 



Distance between root of pectoral and root of ventral 5| 



Length of ventral fin 2f 



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



Length of anal 1|- 



Greatest depth of anal 21 



Length of the longest caudal ray 3i 



Length of the middle caudal ray 1| 



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

 and is contained four times and two-thirds in the total length (the 

 caudal not included) ; the length of the head is a little less than one- 

 fourth of the same. The snout is moderately produced, conical, and 

 is contained once and three-quarters in the postorbital portion of the 

 head; the lower jaw is without a hook, and the mouth closes per- 

 fectly ; the maxillary is considerably longer than the snout, and ex- 

 tends far beyond the vertical from the posterior margin of the orbit ; 

 the width of its broadest part is less than the diameter of the eye. 

 The dentition of the jaws and palate is perfect, the teeth of the 

 mandible being rather stronger than those of tlie in.termaxillary and 

 much longer than those of the maxillary aiid palatine bones ; of the 



