262 



WILLOUGHBY'S CHAK. 



Umbra minor, Torgoeh, Willougiiby ; p. 196. 



" " " Yahrell; Br. Fishes, vol. ii, p. 124. 



Salmo WillouglMi, Gunther; Proceedings of Zoological 



Society, 1862, p. 10, pi. 5. 



The Char of Windermere, but probably not the only species 

 there. 



Body compressed, slightly elevated; length of the head a 

 little more than one half of the distance of the snout and of 

 the vertical from the origin of the dorsal fin. Head compressed; 

 interorbital space convex, its width being less than twice the 

 diameter of the eye. Jaws of the male of equal length 

 anteriorly; teeth of moderate strength, four in each intermaxillary, 

 twenty in the maxillary. Length of the pectoral fin less than 

 that of the head, much more than one half between its root 

 and that of the ventral. Nostrils immediately before the eye. 

 The maxillary bone (mystache) extends scarcely beyond the 

 hindmost margin of the eye; two pairs of teeth on the vomer, 

 four pairs on the tongue. Mr. Mascall observed (Loudon's 

 " Mag. Nat. Hist.," vol. viii, A.D. 1835,) that in the examples 

 he met with, the bones of the gill-membranes were not in 

 equal numbers on both sides. Dr. Gunther remarks that 

 nearly all these bones are exposed to sight in a side view of 

 the fish. The origin of the Dorsal fin is exactly in the 

 middle between the snout and root of the caudal; the rays 

 twelve in number, the first very short, fourth and fifth longest. 

 Anal fin with twelve rays, its origin exactly in the middle 

 between the root of the caudal and that of the outer ventral 

 ray; the first ray very small, the five first rays obscured by 

 being enclosed in a common membrane, the fourth longest, 

 fifth branched. Tail fin forked, the lobes pointed; pectoral 



