Fishes of the Western North Atlantic 509 



on body and tail sectors of trunk; head and fins naked; scales minute, as is charac- 

 teristic of the genus Salvelinus\ 200—235 reported. Lateral line represented as having 

 120—130 scales perforated. 



Head 22 "/o of SL, noticeably less blunt anteriorly than '\n fonlinalis (Fig. 128). 

 Snout narrowly rounded, its length in front of eye 29-30 "/q of head. Tip of Lower 

 JAW about even with tip of Upper jaw, or extending slightly beyond it; rear end of 

 upper jaw reaching to a perpendicular varying in position from about abreast of mid- 

 point of pupil to slightly behind eye in young specimens and in larger females (Fig. 

 125), and to behind eye by a distance about equal to length of eye in mature males 

 (Fig. 126). Rear edge of Eye about 35-43 "/o of distance rearward from snout to rear 

 margin of gill cover. Branchiostegal rays 10— 11 reported. Gill rakers 13 and 16 

 on lower limb and 10 and 10 on upper limb on two fish — from western Greenland and 

 eastern Greenland; 1 1— 18 reported on lower arch and 6—10 on upper limb; the total 

 number in nine fish from northern Canada 17-27, average 23.2 {6y: 910, tab. 4). 



Teeth. Premaxillaries, maxillaries, palatines, and dentary portion of lower jaw 

 each with a single series of sharp, slightly recurved teeth, smaller on the whole and 

 hence less conspicuous than m fonlinalis \ a patch of similar teeth on head of vomer 

 anteriorly on the midroof of mouth; a single row around the tongue; also a patch of 

 minute but sharp teeth on the bones at base of tongue (no teeth there in fontinalis), 

 one such patch farther rearward below, in the pharynegeal region, and two such pat- 

 ches in pharyngeal region above, one of these along the base of each fourth gill arch.' 



Rayed Dorsal fin rhomboid, its corners angular or very slightly blunted, its 

 base 1.7-2.0 in head, its origin a little less than midway rearward (about 47-48 "/o) 

 from tip of snout to upper origin of caudal fin, with 10—12 rays' (9—15 reported), 

 the first 1-3 not branched, the longest ray 0.9-1.1 times as long as base. Dorsal 

 Adipose fin with shape and relative size as shown in Figs. 125, 126, its origin 56-61 "/o 

 of distance rearward from rear end of rayed dorsal base to upper origin of caudal. 

 Caudal with upper and lower margins very weakly convex, the upper and lower 

 corners abruptly rounded, the rear contour weakly concave, the breadth of fin, when 

 widespread, about 1.5 times length of its upper and lower margins. Anal rhomboid, 

 with angular corners, of the shape shown in Figs. 125, 126, its base about 84-95 "/o 

 of base of dorsal, its origin about midway between a perpendicular at midpoint of 

 dorsal and lower origin of caudal, with 

 II-12 rays (8-14 reported), the first 2 Table I. Frequency Distribution of Dorsal (17 fish) 



J. 1 „u J *u 1 t u .. 00 3nd Anal Rays (i8 fish) in Sea-run alpinus from 



not branched, the longest ray about 0.88— ' ^. • v^ , - ^ 



' ° •' Arctic Canada* 



1.2 times longest dorsal ray. Pelvics with 



., . ^, , ^ ,- , Number of rays 9 10 11 12 



midpomt of base about at a perpendicular Dorsal, no. of fish i 4 6 6 



at midpoint of base of rayed dorsal or a Anal, no. of fish 8 7 3 o 



little anterior thereto, the longest ray about * From Vladykov, tj: tables 8, 9. 



7. For photographs of the tongue teeth, hyoid teeth, and pharyngeal teeth of the alpinus species-complex (as represented 

 by the freshwater 5. marstoni and S. aureolus), oi S. fontinalis, and of Cristi-ziomer namaycush, see Vladykov {6^: 920, 

 924, figs. 6-1 1 ). 



8. Precise counting is made difficult by the thickness and fleshy nature of the anterior basal part of the fins. 



