72 SALMONID.E. 



intermaxillary bones. The maxillary bone is longer than the snout 

 by four-fifths of the diameter of the eye. 



The dentition is quite perfect ; the teeth remarkably strong : those 

 on the longitudinal part of the vomer reach very far back on the 

 palate: those of the mandible and intermaxillary are about equal 

 and larger than those of the maxillary and palatine bones. 



The distance of the nostrils from the orbit is about one-third of 

 the diameter of the latter. The interorbital space is flattened ; the 

 position of the eye slightly below the upper profile of the head : the 

 width of this space is less than the length of the snout, and more 

 than half that of the postorbital part of the head. 



The prgeoperculum has no lower limb, being obtusely rounded 

 below ; the posterior margin of the operculum is slightly undulated, 

 and very oblique ; the angle at which it meets the lower limb being 

 a right one. The distance between the upper end of the gill-openiug 

 and the angle of the operculum is greater than that between the 

 latter point and the lower anterior end of the suboperculum. 



The dorsal fin is equally distant from the occiput and the root of the 

 caudal. It is one-eighth of an inch higher than long, and possesses 

 fourteen rays, of which the first three are rudimentary and covered 

 by the skin, the fourth simple and not much shorter than the next, 

 which is branched and reaches the utmost height of the fin ; the 

 final ray is cleft throughout. 



The anal fin is higher than long, its length being about two-thirds 

 of its height. It consists of twelve rays. 



Pectoral fin almost e(iual in length to the postorbital part of the 

 head, reaching about half the distance of its root from that of the 

 ventral ; the latter fin is shorter, and reaches more than midway 

 towards the vent ; its outermost ray is vertically opposite to the ninth 

 of the dorsal. The posterior margin of the caudal fin is convex. 



There are 120 transvei'se series of scales, counted immediately above 

 the lateral line : the series descending obliquely backwards from the 

 origin of the dorsal fin to that line has twenty-three or twenty -four 

 scales ; that from behind the adipose forward to the lateral line has 

 fifteen scales ; there are twenty-three longitudinal series between 

 the lateral line and the root of the ventral. 



Head and upper parts dark brown ; sides and belly greyish brown ; 

 sides with orange-coloured and red round spots in moderate number. 

 Fins blackish. 



Vertebrae 58. Cseca pylorica 38. 



Descri/ption of a Male specimen from the Brenz, a tributary of the 

 Upper Danube, caught after the spawning-time. 



inches. 



Total length 14i 



Greatest depth of the body 2|- 



Length of the head 3f 



Girth of biggest part of body 61- 



Least depth of the tail ; . . . l-l- 



Girth of narrowest part of tail 3^ 



