SALMONIDffi. 395 



»rbit. Lower jaw projecting beyond the upper one, and terminating 

 in a rounded knob turned slightly upwards. Margins of upper ja^t 

 entirely formed by the intermaxillaries, on which there are a few mi- 

 nute setae in place of teeth. Lower jaw, vomer and palatines devoid 

 of teeth. Tongue rough, and pharyngeals armed with teeth. Fins. 

 —Br. 8 ; P. 11 ; V. 8 ; D. 11—0 ; A. 20. Adipose fin thin and con- 

 taining little fat. Lateral line straight and continuous.' 



" Five specimens were sent to me by Dr. Gairdner, but they were 

 unfortunately all so much injured that I can add very few particulars 

 to that gentleman's brief description. In the general form, the ap- 

 pearance of the scales, the black specks on the head and body, the 

 form of the anal and its attachment ta a compressed projecting edge 

 of the tail, the structure of the lower jaw and gill-covers, and in the 

 shape of the head as far as it could be ascertained, this fish closely 

 resembles the Capelin. On the other hand, the ascent of the species 

 into fresh water to spawn, and perhaps its dentition, ally it to the 

 Smelt. Head as in the Capelin, forming one-fifth of the length be- 

 tween the tip of the snout and end of the central caudal rays. Caudal 

 forked. Dorsal commencing a very little anterior to the middle be 

 tween the tip of the snout and end of scales on the'caudal, agreeing, 

 in this respect, more nearly with the Smelt than with the Capelin, in 

 which the dorsal is farther back, its first ray being equidistant from 

 the end of the snout and the extremity of the central caudal ray. Anal 

 of one specimen containing twenty-one rays. Gill-covers thin, papery, 

 and flexible, lined with nacre. In drying, the surfaces of the opercu- 

 lar bones are marked with wrinkles parallel to their sides, as may be 

 observed in the Smelt and Capelin, but not so conspicuously. These 

 wrinkles are most evident on the square operculum. As the thin 

 lining of the mouth and lips is' mostly abraded, from the putrescency 

 of the specimens, the dentition can be only imperfectly ascertained 

 from them. In four specimens no teeth whatever can be discovered ; 

 but in a fifth, a female full of mature roe, the lower jaw is armed 

 with a single series of very slender, curved teeth, rather more distant, 

 and longer than those of the Capelin. There is also a solitary tooth 

 remaining on the vomer of the same specimen, occupying the place of 

 the exterior vomerine tooth in the Smelt, and nearly as large. Tongue 

 corneal as in the Smelt, and not presenting an oval flat surface sur- 



