COREQONUS.] PISCES (OSSEI) MALACOPT. 431 



An inhabitant of streams and rivers, in which it remains stationary all 

 the year, though asserted by Donovan to be migratory *. Partial to clear 

 and rapid waters. Found in Derbyshire, in some of the rivers in the 

 North, and in a few other parts, of England. Food, insects, testaceous 

 mollusca, small fish, &c. Spawns in April and May. Has been known 

 to attain the weight of five pounds t, but is usually found much smaller. 



GEN. 43. COREGONUS, Cuv. 



113. C. Lavaretus, Flem.? (Gwiniad.) Jaws equal; 

 snout scarcely advancing beyond them. 



C. Lavaretus, Flem. Brit. An. p. 182. ? Nilss. Prod. Ichth. Scand. 

 p. 15.? Salmo Wartmanni, Block, Ichth. pi. 105.? Gwiniad, 

 Will. Hist. Pise. p. 183. Penn. Brit. Zool. vol. in. p. 316. 

 pi. 62. Id. (Ed. 1812.) vol. HI. p. 419. pi. 73. Le Lavaret, Cuv. 

 Reg. An. torn. n. p. 307. ? 



LENGTH. From ten to twelve inches. 



DESCRIPT. (Form.) Extremely similar in form to the Common Her- 

 ring. Back slightly arched: greatest depth about one-fifth of the 

 entire length : head triangular, also about one-fifth : snout moderate, 

 scarcely advancing beyond the jaws ; these last equal, and without teeth ; 

 a few very fine velvet-like teeth on the tongue : eyes round, and large ; 

 their diameter contained three times and a half in the length of the 

 head ; the distance between them about equal to their diameter : gill- 

 opening very large : opercle of a somewhat triangular form, the basal 

 margin ascending very obliquely; subopercle approaching to oblong, 

 rounded beneath : lateral line straight, dividing the sides into two nearly 

 equal parts : scales large ; of an oval or roundish form, marked with close 

 concentric circles, but without radiating lines: dorsal occupying about 

 the middle of the entire length ; the distance from the end of the snout 

 to the first ray, when measured behind the fin, reaching a little beyond 

 the end of the fleshy part of the tail ; anterior part of the fin elevated, 

 the fourth ray, which is longest, equalling three-fourths of the depth of 

 the body; fifth and succeeding rays rather rapidly decreasing; length 

 of the fin about two-thirds of its greatest height ; first three rays simple, 

 the rest branched: space between the dorsal and adipose three times 

 that between this last and the caudal: anal commencing considerably 

 beyond the tip of the reclined dorsal, terminating in a line with the 

 adipose; similar to the dorsal in form, but longer and less elevated: 

 caudal deeply forked : pectorals inserted low down, a little shorter than 

 the head : ventrals attached beneath the middle of the dorsal ; axillary 

 scale nearly one-third their own length : 



B. 10 ; D. 13 ; A. 16 ; C. 19, and some short ones ; P. 17 ; V. 11. 



(Colours.) " Head dusky ; pupil deep blue ; gill-covers silvery, powdered 

 with black: back, as far as the lateral line, glossed with deep blue 

 and purple, but towards the line assuming a silvery cast, tinged with 

 gold, beneath which those colours entirely prevail: lateral line marked 

 by a series of distinct dusky spots : ventrals, in some, of a fine sky-blue, 

 in others, as if powdered with blue specks ; the ends of the other lower 

 fins tinged with the same colour." PENN. 



* According to Sir H. Davy, "the Grayling will not bear even a brackish water, without 



ring." Salmonia, (2dEdit.) p. 207. 



t Daniel's Rural Sports, vol. .11. p. 280. 



