278 SALMONID.E OF BRITAIN". 



Genus 2 : — Thymallus, Cmier. 



B ranch iostegals seven- to ten: psendobranclnce well developed. Body somewlat 

 clongaJed and compressed. Gape of mouth small : maxilla sltorf, rarely extending 

 to beneath the middle of the orbit. Minute teeth on, the jaics, near the head of the 

 vomer, and on the jmlatines : none on the tongue. First dorsal ivith many rays 

 {20-2i rays) : second dorsal fin adipose : caudal forhed. Stomach siphonal. Scales 

 rather large. Lateral-line xuell marlced. Ccecal appendages rather numerous. 

 Air-bladder very large. 



Geographical distribution. — lu the iiorthern licmispliere, generally restricted to 

 fresli vs'aters : in Eui'ope, it apjiears to prefer cold and mountainous streams to 

 more temperate climes, and abounds in Scandinavia and Lajjland, the east of 

 Franco and the north of Italy. 



The Grayling, Plate X, fig. 1. 



Thymallus sru Thymus, Bclon. Do Aquat. p. 184; Salvian. fol. 81, t. xvi ; 

 Rondel, ii, p. 187; Gesner, pp. 978, 97'J ; Aldrov. v, c. 11, p. 594; Jonston, iii, 

 lit. i, c. 3, p. 128, t. xxvi, f. 3, 4, and t. xxxi, f. G; Willoughby, p. IS/, t. N. 8 ; 

 Ray, p. 62. C'oregonus, no. 3, Artodi, Synon. p. 20, Genera, p. 10, Species, p. 41. 

 Sahno, Gronov. Zooph. no. 375. Trutla, Klein, Pise. MSS. v, p. 21, no. 15, t. iv, 

 f. 5. Grayling, Pennant, Brit. Zool. (Ed. 1770) iii, p. 311, pi. Ixi (Ed. 1812), iii. 

 p. 414, pl. Ixxii ; Low, Fauna Oread, p. 224 ; Davy, Salmonia, 1832, p. 198 ; 

 Duhamcl, Peclies, ii, p. 218, pl. iii, f. 2. 



Sahno thymallus, Lin. Syst. Nat. i, p. 512; Bloch, Fisehe Dcuts. i, p. 158, 

 t. sxiv; Gniel. Linn. p. 1379 ; Bonn. Ency. Ich. p. 167, pl. Ixis ; Bl. Schn. p. 410; 

 Donovan, Brit. Fish, v, pl. Ixxxviii ; Pall. Zoo. Ross.-As. iii, p. 364; Turton, Brit. 

 Fauna, p. 104; Gronov. ed. Gray, p. 153. 



Salmo thymus, Bonnaterre, 1. c. p. 1G7. 



Corrgonus thymallus, Lacep. v, p. 254 ; Flcm. Brit. An. p. 181 ; Jurine, Poiss. 

 Lac Leman, page 179, pl. v. 



Thymallus vidgaris, Nilss. Prod. Ich. Scan. p. 13, and Skand. Fauna Fisk. 

 p. 447 ; Jenyns, Manual, p. 430 ; Bonap. Peso. Eur. p. 23 ; Kroycr, Dan. Fisk. iii, 

 p. 35, c. fig. ; Yarrell, Brit. Fishes (ed. 1), ii, p. 79, c. fig. (ed. 2), ii, p. 136 

 (ed. 3), i, p'r304; White, Catal. p. 80 ; Thompson, Nat. Hist. Ireland, iv, p. 167 ; 

 Schlegel, do Dier. Ned. p. 133 ; Siebold, Sus. w. f. Mit. Eur. p. 267 ; Giinther, 

 Catal. vi, p. 200 ; J. Wai-nimont, Pub. de I'lnst. de Luxen. xi, pp. 1-48 ; Collett, 

 Norges Fiske. p. 171 ; Feddcrscn, p. 78 ; Cancstrini, Fauna Italia, Peso. p. 23 ; 

 Houghton, Brit. F. W. Fish. p. 149, c. fig.; Moreau, Poiss. France, iii, p. 543; 

 Giglioli, Cat. Pesc. Ital. p. 42; Day, British and Irish Fish, ii, p. 131, plate 

 cxxiv. 



Thymallus vexillifcr, Agass. Mem. Soc. Sc. Nat. Neuch. i, t. B, t. D, f. 5-8, and 

 Poiss. d'cau douce, pis. xvi, xvii, xviid; Cuv. and Val. xxi, p. 438; Heckel and 

 Kner, Suss. w. f. p. 242 ; Blanchard, Poiss. des caux douces, France, p. 437, 

 f, 113. 



Thymalus gymnofhorax, Cuv. and Val. xxi, p. 445, pl. 625 ; Giinther, Fisehe des 

 Neckars, p. li7. 



Grayling, Couch, Fish. Brit. Isles, iv, p. 280, pl. ccxxviii. 



B. vii-x, D. 20-24 (^Aif-^) I 0, P. 15-16, V. 10-11, A. 11-14 (a.^%), C. 21, 

 L. 1. 75-85, L. tr. Tf:f 3, Cffic. pyl. 22-30, Vert. 39/22. 



Length of head 6j to 6, of caudal fin 6, height of body 4j to 5 in the total 

 length. Eyes — diameter of each 4 in the length of the head, 1^ diameters from 



