1. SALMO. 129 



long) it reaches slightly beyond that vertical. It is armed with 

 20-22 teeth of moderate size : six teeth in each intermaxillary, fif- 

 teen in each mandible ; three pairs on the vomer, arranged in two 

 longitudinal series slightly converging behind ; nineteen on each 

 palatine bone, and sis pairs on the tongue. Operculum obtusely 

 rounded behind, its length being two-thirds of its height ; the sub- 

 operculum projects but little beyond the hind margin of the opercle, 

 its vertical width being one-half of that of the operc\ilum. 



The origin of the dorsal fin is a little nearer lo the end of the 

 snout than to the root of the caudal ; the length of its base is one- 

 third more than that of its last ray, and contained once and a quarter 

 in that of the fourth ray. The fifth and sixth rays form an acute 

 point, and the upper margin of the fin is straight. The first ray is 

 rudimentary, the second half the length of the third, the third two- 

 fifths the length of the fourth, the fifth simple, the sixth branched, 

 the last split to the base. The distance of the adipose fin from the 

 dorsal is but little more than twice the base of the latter. 



The origin of the anal fin is exactly in the middle between the 

 root of the caudal and that of the outer ventral ray ; the length of 

 its base is somewhat less than that of the dorsal, and is contained 

 once and a quarter in the length of the fifth ray. 



Caudal fin forked, one of the middle rays being two -fifths as long 

 as the outer ones, the length of which is contained six times and a 

 half in the total ; lobes pointed. 



The base of the pectoral is entirely free, and not overlapped by the 

 gill-cover apparatus ; it terminates at a considerable distance from 

 the vertical from the origin of the dorsal, equal's the length of the head 

 without snout, and is contained once and one-third in the distance 

 between its root and that of the ventral. 



The ventral is itiserted below the middle of the dorsal. 



A specimen, 12 hiches long, from the same locality, agrees very well 

 with the one first described ; its operculum, however, is as long as 

 high, and the length of the pectoral fin equals nearly one-half of 

 the distance between its root and that of the ventral. 



An immature specimen, 10 inches long, differs widely from the 

 preceding, its body and its head being much more elongate. The 

 length of the head is more than the height of the body, the former 

 being one-fifth, the latter one -sixth of the total length; the oper- 

 culum is longer than high, and the height of the head above the 

 mandibulary joint is less than the distance between the posterior 

 margin of the orbit and the end of the operculum ; the maxillary 

 extends nearly to the vertical from the hind margin of the orbit. 

 The length of the pectoral fin is considerably less than one-half of 

 the distance between its root and that of the ventral. 



With regard to the coloration, this species does not differ from 

 S. willughbii ; the immature specimen has the sides silvery, and the 

 red of the lower parts is replaced by a slight tinge of orange- col our. 



The largest of our Scotch specimens is a mature male 11 inches 

 long. It differs from the male from Quickjock in having a more 

 loongate body, the depth of which is one-sixth of the total length. 



VOL. VI. *^ 



