226 riscEs. 



distinguished by a soft prominence at the end of the snout. 

 From the North Sea and the Baltic, where it pursues the Her- 

 ring. It is also taken in the lake of Haarlem, &:c.(l) 



C. marcemda; Salmo marcenida, Bl., 28, f. 3j 'S'. albula, Ascan. 

 pi. xxix. Strongly characterized by the lower jaw, which pro- 

 jects beyond the upper one.(2) 

 The others have an obtuse snout, as if truncated; it is extremely 

 difficult, however, to assign to them precise characters. Such are 



C. marcsna; Salmo marama, Bl., 27. From the lakes of Bran- 

 debourg; its snout, although obtuse, extends beyond the mouth. 



C. Wartmanni; Salmo Wartmunni^ Bl., 105. Fi'om the lakes 

 of Bourget, Constance, the Rhine, 8cc. The snout is truncated 

 even with the front of the mouth, the head is shorter in pro- 

 portion, and the form longer and more slender. 



C. fera, Jurine, Mem. dc la See. Phys. of Geneva, HI, part 

 I, pi. vii. From the lake of Geneva, and some others; it is 

 higher than the Wartmanni, and has larger fins. 



C. hyemalis, Jurine, lb., pi. viii. From the lake of Geneva, 

 where it is found in the winter onlyj its head is thicker and its 

 fins are larger in proportion than in the fera. 



C. palxoj Cuv. from the lake of Neuchfitel; higher than any 

 of the preceding species, particularly at the nape, and deeply 

 coloured. 



C. sikus, Cuv.; Ascan., pi. xxx, under the name of Lavaret. 

 From the rivers of Norway; the snout is prominent as in the 

 maroena, but the body is narrower and browner.(3) 



Argentina, Lin. 



The mouth small and jaws without teeth, as in Thymallus, but 

 the mouth is depressed horizontally; the tongue is armed, like that 

 of the Trouts, 8cc. , with strong hooked teeth, and there is a trans- 

 verse range of small ones before the vomer. There are six rays in 



(1) The genus Thiptehoxotus, Lacep., is founded on a bad figure of this 

 Holding sent to Rondelet (Rondel., 195), to which, by some mistake, three dor- 

 sals had been given — that genus must consequently be suppressed. The very 

 improper name of Mhula nobilis was transferred to it by Schoenefeld, and Lin- 

 naeus and Artedi confounded it with the Coregonus, an example followed by 

 Bloch. The Salmo thymallus latus, Bl., 26, appears to be a variety of it in the 

 spawning season. 



(2) Add Salmo clupeo'ides. Pall. f 



(3) Add, Salmo silus, Ascan., XXIV; — Coregonus alius, Lesueur, Ac. Nat. Sc. 

 Phil., I, p. 35; — Cor. quadrilateralis, Richardson, Franklin's A'^oy., pi. xxv; f. 2; — 

 Salmo peled. Pall. 



