220 APPENDIX. No. IV. 



Arctic regions of the western hemisphere. Two specimens 

 obtained off Cape Hayes, Grinnell Land. 



8. Salmo akcturus (sp. n.) — The northernmost salmo- 

 noid known at present. This charr cannot be identified 

 with any of the other races of this division of Scdmo ; 

 it comes nearest to the charr of Killin (Inverness-shire), 

 but differs from it in having a more slender body, rather 

 smaller scales, shorter fins, and a less number of pyloric 

 appendages. 



Body rather elongate ; head small, two-ninths or nearly 

 one-fifth of the total length (without caudal), scarcely more 

 than one-half of the distance between the snout and the 

 vertical from the origin of the dorsal fin. The snout is 

 remarkably obtuse ; the maxillary varies in length : in males 

 of the same size it sometimes reaches scarcely to, sometimes 

 a little behind, the hind margin of the orbit ; in the female 

 it is smaller and shorter. Teeth small ; vomerine teeth 

 limited to the anterior extremity of the bone ; a band of 

 villiform teeth along the middle of the hyoid bone. Prseoper- 

 culum with a distinct lower limb ; suboperculum about twice 

 as long as deep ; pectoral but little shorter than the head, 

 exceeding in length one-half of the distance of its root from 

 the ventral. Ventral terminating at a considerable distance 

 from the vent. D. 13 ; the longest ray as long as the head 

 (without snout). A. 12. Caudal moderately excised, its 

 middle rays half the length of the outer ones. Scales minute. 

 Branchiostegals 11. 



Upper parts of a dull brownish green, passing on the sides 

 into the silvery or reddish colour of the lower parts. Dorsal 

 and caudal of the colour of the back ; paired fins and anal 

 yellowish. No dots or ocelli. Young with numerous parr- 

 marks. 



The number of pyloric appendages were found to vary ; 

 one male has 31, another 35, a third 44, and a female 42. 



Several specimens were obtained in Victoria Lake (lat. 

 82° 34' N.), and in freshwater lakes near Floeberg Beach (lat. 

 82° 28' N.) Dr. E. Moss kindly communicated to me a 





