1. SALMO. Ill 



long. 8iibopenailum elevated, twice as long as deep. The posterior 

 point of junction of operculum and suboperculum is midway between 

 the upper end of the giU-opening and the lower anterior angle of the 

 suboperculum. Pra^operculum with a distinct lower limb, and with 

 the hind margin slightly emarginate above the angle. Snout of 

 moderate length, produced in fuU-grown males, which have the 

 lower jaw hooked during the spawning-season ; maxillary longer 

 than the snout, rather strong and broad, not reaching the posterior 

 margin of the eye in examples 12 inches in length, and extending 

 somewhat behind it in mature ones (from a length of 22 inches). 

 Head of the vomer triangular, broader than long, with a transverse 

 series of teeth across its hinder margin ; body of this bone with a 

 shar]^) longitudinal ridge, bearing a single series of teeth, the poste- 

 rior of which are lost before the specimens attain a length of 18 

 inches ; these teeth form a zigzag series in young examples. Tins 

 not short. The caudal fin is slightly emarginate in specimens up to 

 a length of 22 inches, in which the middle rays are only half as long 

 as the outer, longest one. Tail covered with rounded scales ; there 

 are fourteen in a transverse series running from behind the adipose 

 fin obliquely forwards to the lateral line. 



Silvery ; back with a brownish or greenish shade ; sides with more 

 or less numerous small, angular, sometimes X-like black spots ; 

 dorsal fin and opercles with a few rounded black spots. 



Sweden (Lake Wenern) ; non-migratory. 



This species is distinguished from S. trutta by a stronger maxLUary, 

 smaller eye, more deeply emarginate caudal fin, higher body, &c, 



a-c. Males, 36 inches long : stuffed. River Gotha, near the Lake 

 Wenern. From Mr. L. Lloyd's Collection. 



d. Female, 22 inches long. Lake Wenern. Purchased of Mr. 



Wheelwright. — Ca^c. pyl. 59 ; Vert. 59. 



e. Twelve inches long, not in good state. Lake Wenern. Purchased 



of Mr. WheelwTight. 

 f-g. Nine inches long. River Gotha. From Mr. Lloyd's Collection. 

 — Csec. pyl. 61 and 62 ; Vert. 60 in both. 



27. Salmo polyosteus. 



B. 10. D. 13. A. 11. P. 14. V. 9. L. lat. 128. 



L. transv. ^'. Vert. 61-62. Ctec. pyl. 40. 



ca. 30 ^•' 



Head rather high, compared with its length ; eye of moderate size, 

 its diameter being rather more than one-fourth of the length of the 

 postorbital portion of the head in specimens 16 or 17 inches long. 

 Suboperculum rather narrow, nearly thrice as long as broad ; the 

 posterior point of junction of opercle and subopercle is midway 

 between the upper end of the gill-opening and the lower anterior 

 angle of the suboperculum. Proeoperculum subcrescentic, with the 

 lower limb very incUstinct. Snout of moderate length. Maxillary 

 longer than the snout, broad, its greatest width being two-thirds of 

 the diameter of the eye ; it reaches to somewhat behind the vertical 



