106 SALMONID^. 



culum is nearer to the lower anterior angle of the suboperculnm than 

 to the upper end of the gill-opening. Maxillary very ijarrow and 

 feeble*, extending somewhat beyond the hind margin of the orbit in 

 females 17 inches long, and to the hind margin in young examples 

 of 9 inches in length. Dentition feeble ; the vomerine teeth form 

 a single series, and are gradually lost with age. Fins moderately 

 develoijcd ; pectoral rather obtuse: caudal fin' truncate in mature 

 examples (from 12 inches in length), with the lobes acutely pointed ; 

 in younger examples of 9 inches in length, the middle rays are rather 

 more than half as long as the outer ones. Tail rather broad, covered 

 with rounded scales, which are a Uttle larger than those of the trunk. 

 There are fifteen scales in a transverse series running from behind 

 the adipose fin obliquely forwards to the lateral line. 



Silvery, "wdth scattered, black, X-shaped spots. No parr-marks in 

 a specimen of 9 inches in length, 



A migratory species, from the Eidfjord lliver in Norway, re- 

 markable for the small size of the eye, and closely allied to S. galli- 

 vensis. 



a-c. Females, from 12 to 17 inches long. Presented by Professor 



N. S. Maskelyne. Caught in August. 

 d. Nine inches long. Presented by Professor N. S. Maskelyne. 



Description of a Female 17 inches long. Ova semimature. 



The greatest depth of the body is below the origin of the dorsal 

 fin and is contained thrice and two-thirds in the total length (caudal 

 not included) ; the length of the head is two-ninths of the same. 

 The snoiit is slightly produced, mnch pointed, and one-half of the 

 length of the postorbital portion of the head. The maxillary is longer 

 than the snout by somewhat more than one-half the diameter of the 

 eye, and extends about one-eighth of an inch behind the vertical 

 from the hinder margin of the orbit ; the width of its broadest part 

 is one-half of the diameter of the eye (after the skin has been re- 

 moved from the bone). The dentition of the jaws and palate is 

 feeble, the teeth of the tongue and mandible being larger than those 

 of the intermaxillary, which, again, exceed slightly those of the max- 

 illary and palatine bones, which are about equal. The vomer has 

 the head of an iiTcgular shape, the anterior margin being deeply 

 notched ; it is toothless ; the longitudinal series is formed by three 

 small teeth, the ridge of the body of the bone being very low. 



The distance of the nostrils from the orbit is about three-fourths 

 of the diameter of the latter ; the interorbital space is very convex, 

 the orbit being far below the upper profile of the head ; the width of 

 this space is one-fourth of an inch less than the length of the max- 

 illary bone, and two-thirds of the length of the space between the 

 pupil and the angle of the pra^operculum. The prseoperculum has 

 the posterior margin, angle, and lower limb rounded, the latter being 

 well developed. The posterior margin of the operculum is curved, 

 and forms a somewhat obtuse angle with the lower margin. A line 

 * This is especially striking when the bone is divested of the covering skin. 



