DESCRIPTION OF THE GRAYLING. 171 



quadrangular spots of Prussian-blue, on the anterior part of the 

 body, each tinging the margin of four adjoining scales. The 

 head is hair brown above, the cheeks and gill-covers the same, 

 combined with purplish tints, and there is a blue mark on each 

 side of the lower jaw. The dorsal fin has a blackish grey colour, 

 with some lighter blotches, and is crossed by rows of beautiful 

 Berlin-blue spots ; it is edged with light lake-red. The ventrals 

 are streaked with reddish and whitish lines in the direction of 

 their rays. 



"The scales are covered with a thickish epidermis, conse- 

 quently having little lustre. 



" The body is compressed, with an elliptical profile, the head, 

 when the mouth is shut, ending acutely, but when viewed from 

 above, or in front, the snout is obtuse. The greatest depth of 

 the body is scarcely one-fifth of the total length, excluding the 

 caudal, or one-seventh including it. Orbit large, distant half 

 its diameter from the snout, and two diameters from the edge 

 of the gill-cover. Nostrils midway between the orbit and the 

 tip of the snout. Mouth not cloven as far back as the edge of 

 the orbit. Intermaxillaries longer than in the Coregoni, but 

 overlapping the articular end of the labials less than in the 

 Trutta. Labials, thin elliptical plates, the posterior piece 

 lanceolate, and as broad as the anterior one. Under jaw 

 tolerably strong and rounded at the tip. 



" The teeth are small, subulate, pointed, and slightly curved, 

 standing in a single series on the intermaxillaries, in two rows 

 on the palatines, and in clusters of six or seven on the vomer. 

 The tongue is smooth, but the pharyngeal bones and cartilagi- 

 nous rakers of the branchial arches are rough. 



