1. SALMO. 31 



gularly X-shaped black spots. Sides of the head and dorsal fin with 

 a few small round black spots. Caudal and inner side of pectoral and 

 ventral blackish. 



Pyloric appendages forty-five. 



Description of a Female Sea-Trout, from the Tweed, obtained during 

 the spawnincj-time, in January. 



mini , inches, 



iotal length 27^ 



Greatest depth of the body 5! 



Length of the head 51 



Girth of the biggest part of the body 14^ 



Least depth of the tail 2J- 



Girth of the narrowest part of the tail • • 5I 



Distance between the end of the snout and the eye . . if 



Diameter of the eye 5 



Length of the maxillary bone 2 ^. 



Distance between eye and angle of prteoperculum . . 2!'' 



Greatest width of operculum ll 



Greatest depth of operculum 2** 



Distance between occiput and origin of dorsal fin . . 8^ 



Distance between end of dorsal and root of caudal . . 9! 



Length of base of dorsal 2X 



Greatest height of dorsal 2^ 



Length of pectoral 2i 



Distance between root of pectoral and root of ventral si 



Length of ventral fin 2-^ 



Distance between root of ventral and origin of anal . . 5| 



Length of anal 2^ 



Greatest depth of anal 2^ 



Length of longest caudal ray 3 



Length of middle caudal ray 13 



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

 fin, and shghtly exceeds the length of the head, being two-ninths of 

 the total length (without caudal). 



The snout is moderately produced, conical, and is three-fifths of 

 the length of the postorbital portion of the head, or seven-eighths of 

 that of the maxillary bone. The mandible is without hook, and the 

 jaM^s can be brought into perfect contact. The maxillary bone is 

 longer than the snout by two-fifths of the diameter of the eye, and 

 extends beyond the posterior margin of the orbit : the width o'f its 

 broadest part is two-thirds of the diameter of the eye. 



The teeth of the mandible are larger than those in the upper jaw ; 

 those of the intermaxillary bone are about equal to those of the pala- 

 tine series, and are larger than those of the maxillaries. Of the 

 vomerine teeth only two remain ; they are placed in a transverse 

 series between the head and body of the bone. 



The interorbital space is very convex, the eye being situated con- 



