salmonim:. i3i 



Genus IV. Thymallus, Guvier. 



Brancliiostegals seven to ten : pseudobranchice well developed. Body somewhat 

 elongated and compressed. Gape of mouth small : maxilla short, rarely extending 

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

 vomer, and on the palatines: none on the tongue. First dorsal with many rays 

 (20-24 rays) : second dorsal fin adipose : caudal forked. Stomach siphonal. Scales 

 rather large. Lateral-line tcell marked. Pyloric appendages rather numerous. 

 Air-bladder very large. 



Geographical distribution. Temperate portions of the northern hemisphere, 

 generally restricted to fresh waters. 



1. Thymallus vulgaris, Plate CXXIV. 



QvfiaXXog, iElian, Lib. xiv, c. 22. 



Thymallus sen Thymus, Belon. De Aquat. p. 184; Salvian. fol. 81, t. xvi ; 

 Rondel, ii, p. 187 ; Gesner, pp. 978, 979 ; Aldrov. v, c. 14, p. 594 ; Jonston, iii, 

 tit. i, c. 3, p. 128, t. xxvi, f. 3, 4, and t. xxxi, f. 6; Willughby, p. 187, t. N. 8 ; 

 Ray, p. 62. Coregonus, no. 3, Artedi, Synon. p. 20, Genera, p. 10, Species, p. 41. 

 Salmo, Gronov. Zooph. no. 375. Trulta, Klein, Pise. MSS. v, p. 21, no. 15, t. iv, 

 f. 5. Grayling, Pennant, Brit. Zool. (Ed. 1776) iii, p. 31 L, pi. lxi (Ed. 1812), iii, 

 p. 414, pi. lxxii ; Low, Fauna Oread, p. 224; Davy, Salmonia, 1832, p. 198. 

 Duhamel, Peches, ii, p. 218, pi. iii, f. 2. 



Salmo thymallus, Lin. Syst. Nat. i, p. 512 ; Bloch, Fishe Deuts. i, p. 158, 

 t. xxiv ; Gmel. Linn. p. 1379 ; Bonn. Ency. Ich. p. 167, pi. lxix ; Bl. Schn. p. 410 ; 

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

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



Salm.o thymus, Bonnaterre, 1. c. p. 167. 



Coregonus thymallus, Lacep. v, p. 254 ; Flem. Brit. An. p. 181 ; Jurine, Poiss. 

 Lac Leman, pi. vi. 



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

 p. 447 ; Jenyns, Manual, p. 430 ; Bonap. Pesc. Eur. p. 23 ; Kroyer, 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. 304; White, Catal. p. 80 ; Thompson, Nat. Hist. Ireland, iv, p. 167 ; 

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

 Catal. vi, p. 200 ; J. Warnimont, Pub. de l'lnst. de Luxen. xi, pp. 1-48 ; Collett, 

 Norges Fiske, p. 171; Feddersen, p. 78; Canestrini, Fauna Italia, Pesc. p. 23; 

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

 Giglioli, Cat. Pesc. Ital. p. 42, 



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

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

 Kner, Suss. w. f. p. 242 ; Blanchard, Poiss. deseaux douces, France, p. 437, f. 113. 



Thymalus gymnothorax, Cuv. and Val. xxi, p. 445, pi. 625 ; Giinther, Fische des 

 Neckars, p. 117. 



Grayling, Couch, Fish. Brit. Isles, iv, p. 280, pi. cexxviii. 



B. vii-x, D. 20-24 (tT-U) \0, P. 15-16, V. 10-11, A. 11-14 (f.^), C. 21, 

 L. 1. 75-85, L. tr. T f:f3, Coec. pyl. 22, Vert. 39/22. 



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

 length. Byes diameter of each 4 in the length of the head, 1| diameters from 

 the end of the snout, and about the same distance apart. Its form is rather 

 elongated and excessively graceful ; dorsal profile more curved than the abdominal. 

 Upper jaw very slightly the longer ; the posterior extremity of the maxilla reaches 

 to beneath the anterior edge or first third of the orbit. Teeth fine ones in the 

 jaws, near the head of the vomer, and on the anterior portion of the palatines ; 

 none on the tongue. Fins these vary with the sex, the last dorsal rays are 



9 * 



