OF GREAT BRITAIN. 57 



of head compared to length of head and body, without tail-fin, 

 as i to 4 ; depth of body rather greater than length of head. 

 Profile of back and belly about equally convex. Head blunt ; 

 lower jaw longest when the mouth is open, but shutting within 

 the upper jaw on its being closed. Back-fin commencing be- 

 tween point of nose and commencement of upper rays of tail- 

 fin ; third ray of back-fin longest, and longer than base of fin. 

 Small back-fin commencing halfway between origin of large 

 back-fin and upper extremity of tail-fin ; pectoral fin two-thirds 

 of length of head ; ventral fins under middle of first back-fin, 

 and half-way between origin of pectoral fin and end of base of 

 anal fin ; anal fin beginning halfway between origin of ventral 

 fin and commencement of lower rays of tail-fin. Tail slightly 

 forked, very gradually becoming square, or slightly convex in 

 very old fish. Pyloric caeca l seldom exceeding 46 in number. 

 Teeth numerous, strong, and curving inwards, in six rows on 

 upper surface of mouth and jaw, and four on lower. Teeth 

 larger in males than in females. Number of scales above and 

 below lateral line about 25. Vertebrae 56. 



The following were the full colours of a Dart- 

 moor Trout taken by the author in May, 1885 : 



The under line of belly (not seen when fish is looked at 

 sideways), white ; sides, for one third of the way up, golden 

 yellow ; two lines of red spots, one above and one below the 

 lateral line : dark brown spots all over back, also above the 

 lateral line, and a few below it just behind the gills; a few 

 black or dark brown spots on the gill cover (opercuium). Head, 

 gill-covers, and irides green bronzy-gold ; back and top of 

 head, bronzy-green ; golden under the throat. Dorsal-fin green 

 with black spots; Pectoral- and ventral-fins orange; anal-fin 

 green-orange, edged with white ; adipose-fin having a bright 

 margin of pinky-red, the same colour as the red spots on the 

 body ; tail-fin orange-green, top and bottom edges fringed with 

 orangey-red. 



Fin-rays: D. 14: P. 14: V. 9 : A. n : C. 19. 



1 The pyloric caeca are narrow pouches or culs-de-sac, more or 

 less numerous, attached to the pylorus or mouth of the intestines. 



