3. BEACHTMASTAX. 



163 



This genus is intermediate between Sahno and Corerjonus. Even 

 \i Sahnn fluviutUls (p. 141) should prove to be the male of 8aJmo 

 corecionoides, still the small size of the ova would be a character of 

 sufficient importance to separate these fishes generically from Sahno. 



1. Brachyinystax coregonoides. 



Salmo lenok, Pallas, Beise, ii. Append, p. 716 ; L. Gm. iii. p. 1373. 



corepfonoides, Pallas, Zoogr. Ross.-As. iii. p. 362 ; Cuv. S,- Val. 



xxi. p. 272. 



B. 11-12. D. 14. A. 12-13. L. lat. 144-164. 



Habit stout ; head of moderate size, its length being two-ninths 

 of the total (without caudal) ; bones of the head very solid. Snout 

 of moderate extent, broad, obtuse ; teeth small ; vomer with teeth 

 anteriorly only. Maxillary similar to that of a Coregonus, short 

 and broad, not extending to below the middle of the eye. Prae- 

 operculum \dih a long lower limb. Adipose fin large and thick ; 

 caiidal deeply emarginate. Body with numerous brown spots. 



We refer two specimens from PaUas's Collection to this species : 

 one (no. 86) is IS inches long, and evidently the typical specimen; 

 the other (no. 84) is 21 inches long, and, although named " O.Jlu- 

 victtilis var. tahnen," is most certainly another individual of the same 

 species. 



"It abounds in rivers and the strong mountain-torrents of the 

 Altai, which are tributaries of the Ob and Irtis, as also in the col- 

 li 2 



