22 SALMONID^. 



right and left ; three or four small teeth form a very short transvei'se 

 series on the front part of the vomer. 



The distance of the nostrils from the orbit is only one-third of the 

 diameter of the latter; the interorbital space is flattish, with an 

 obtusely prominent median longitudinal ridge, and its width equals 

 the diameter of the eye. The posterior margin of the operculum 

 and subopercnlum is angularly bent, the angle itself being rounded ; 

 the point of junction of these two bones is midway between the 

 upper end of the giU-opening and the lower end of the suboperculum. 

 The angle of the praeoperculum is more obtusely rounded than in 

 adult specimens. 



The distance of the origin of the dorsal fin from the occiput is 

 considerably more than its distance from the adipose fin ; it is higher 

 than long, and composed of fourteen rays, the three anterior ones 

 being rudimentary, the fourth simple, not quite as high as the fifth, 

 which is branched and nearly as long as the sixth, which forms the 

 highest point of the fin. The anal fin is higher than long, and com- 

 posed of eleven rays, the first being rudimentary, the secoud simple, 

 nearly as long as the third, which is branched, the fourth and fifth 

 being the longest rays of the fin. Caudal fin deeply forked, its middle 

 rays being not quite half as long as the lobes. The length of the 

 pectoral fin equals the distance of the end of the giU-cover from the 

 nostrils. Ventral fin much shorter, terminating at a short distance 

 from the vent ; the outer ventral ray is in the vertical from the 

 middle of the dorsal fin. 



There are 120 transverse series of scales counted immediately 

 above the lateral line ; the transverse series descending obliquely 

 backwards from the origin of the dorsal fin to the lateral line con- 

 tains twenty -two scales ; and there are twenty longitudinal series 

 of scales between the lateral line and the base of the ventral. 



The upper parts are uniform brownish olive, each scale shining 

 silvery. Lower parts entirely silvery. There are eleven dusky 

 transverse bars on each side of the body, across the lateral line ; they 

 are rather wider than the interspaces. Back with scattered small 

 black spots, the number of which is very variable ; there is con- 

 stantly a round, deep-black spot, as large as the pupil, in front of 

 the middle of the operculum ; and another similar spot generally 

 occupies the posterior end of the suture between the operculum and 

 suboperculum. Dorsal fin with large, irregidar, black interradial 

 spots, and with a narrow whitish antero-superior edge. Caudal 

 uniform blackish. Posterior half of the pectoral blackish. Ventral 

 and anal whitish, the latter with a bright, yellowish white, antero- 

 inferior edge. 



2. Salmo trutta. 



Synonymy of Scandinavian specimens, 

 Laxoring, Orlax, Taj men. 



? Sahiio no. 5, Artedi, Synoti. p. 24 ; uo. 3, Genera, p. 12, and Species, 

 p. 51. (Description very short and insufficient.) 



