388 SYNOPSIS. 



rather exceeding the length of the head ; jaws equal and 

 without teeth, a few very fine ones on the tongue ; first 

 dorsal fin commencing about half-way between the point 

 of the nose and the root of the caudal fin, the latter deeply 

 forked. Fin-rays, D. 13 : P. 17 : V. 11 : A. 16 : C. 1.9. 

 Axillary scale at the insertion of the ventral fins, about 

 one- third of their length: head and back dusky blue, sides 

 lighter and tinged with yellow ; other parts silvery white, 

 the fins tinged with dusky blue towards the tips. Cuv. 

 Reg. An.; Jurine, Mem. Soc. Phys. de Geneve, iii. pt. 1, 

 pi. 7? Tarr. Brit. Fish, ii. p. 142. Salmo lavaretus, 

 Penn. Brit. ZooL, iii. p. 419. Coregonus lavaretus, Flem. 

 Brit. An., p. 1 82 ; Jenyns' Brit. Vert.^ p. 431. 



Sp. 135. C. WillugJibii. Vendace. Lower jaw longest, and 

 ascending in an angle to meet the upper ; greatest depth 

 one-fourth of the entire length, excluding the caudal : 

 head small, compared with the whole length as two to 

 seven, the crown heart-shaped, and so transparent that 

 the skull and brain may be discovered ; tongue only with 

 a few almost imperceptible teeth ; first dorsal commencing 

 midway between the nose and root of the caudal, the 

 anterior part double the length of the base of the fin ; 

 ventrals large ; tail acutely forked. Fin-rays, D. 1 1 

 P. 16 : V. 11 : A. 15 : C. 19. Eye very large, silvery 

 tinged with yellow, pupil blue ; body above tender greenish 

 brown, gradually shading off into silvery ; dorsal fin the 

 same colour as the back, lower fins bluish white. Jardim , 

 Brit. ScUm., pi. 6 ; Yarr. Brit. Fish. ii. 146. C. nianr- 

 nula, Jardinc, Edin. Jour, of Nat. and Geog. Soc. iii. p. 4 

 pi. 1 ; Jenyns"* Biit. Vert. p. 432. Vendace, Knox, Trans. 

 Roy. Soc. Edin., xii. p. 503. 



8p. 1*36. C. Lacepedii. The Powan. Head long, narrow 

 and oval ; depth of body less than the length of the head, 

 first dorsal situate as in C. WillugTibii ; adipose fin largf 

 and thin ; ventrals commencing under the middle of the 

 dorsal ; tail deeply forked, the long upper rays curving a 

 little downwards. Fin-rays, D. 14 : P. 16 : V. 12 : A. 13 : 



