78 Records of the Indian Museum. [Vol. VI, 



The last three groups, K. 2, G. i and 2, consist of fish too 

 small for the present purpose. 



We can now proceed with an analysis of the five distinguish- 

 ing characters in the groups. 



Analysis of differences between 5. stoUczkae and S. severzovi : — 



Character (a). Bod^^ higher in 5. severzovi than in S. stoliczkae. 

 {b). Eye larger ,, 



,, (c). Mouth: anterior margin on level with lower border 

 of orbit in 5. severzovi ; below this level in S. stolic- 

 zkae. 

 ,, {d). Darker colour of 5. severzovi. 



,, (e). Smaller size of sexually mature specimens of S. 

 severzovi. 



Character (a). The two groups named S. severzovi (P. i, 

 Ssewerzoff's, and P. 4, Alcock's) are both from the Pamirs. The 

 relation of the body-length to the maximum body-height is 5*4 in 

 both (see table i). That is, on the average they are higher in the 

 body than the two groups of S. stoliczkae from the same region 

 (P. 2, Ssewerzoff's, and P. 3, Stoliczka's). Vide table i. On 

 consulting the table of extreme measurements, on the other hand 

 (table iii, col. 3), it will be seen that this is only true for the 

 average measurements : the lowest-bodied fish of the Ssewerzoff 

 groups (6*2o) is considerably lower than the highest-bodied fish of 

 the Stoliczka groups (4'48), and indeed the latter is higher than 

 even the highest-bodied of the Ssewerzoff groups (5*oo). 



Although the two Ssewerzoff groups from the Pamir (P. i and 

 P. 4) have a greater average bod3^-h eight than the two Stoliczka 

 groups (P. 2 and P. 3), this average is lower than that of groups D. i 

 and K. i, which have the head of Stoliczka's type in a marked 

 degree (character c). 



Character (b). It is clear that the eye diminishes in size 

 relatively to the head with the increase in size of the fish. There- 

 fore groups of fish of the same average size only, can be com- 

 pared in regard to this character. The two Ssewerzoff groups P. i 

 and P. 4 taken together have an average length of about 150 mm. 

 and the two Stoliczka groups from the Pamir-Ladakh region, P. 2 

 and P. 3, combine to very much the same average: these may 

 be compared with the medium-sized Kang-ma K. r group (table i, 

 col. 3). The three arrange themselves as follows : — Larger eye (4*3) 

 S. severzovi; smaller eye (4'75) S. stoliczkae (Pamir-Ladakh and 

 Kang-ma). 



The characters b and c then do show some parallelism. But, 

 again, there is considerable overlapping of the extreme measure- 

 ments, some specimens in P. 3 having larger eyes (4'Oo) than some 

 of P. I and P. 4 (4-32 and 5*oo). 



The evidence of the Chumbi group Ch. is, moreover, definitely 

 against this parallelism. Their average length is only 136 mm. 

 and therefore their eyes should be proportionately larger than in 

 larger fish. They have the Ssewerzoff" type of head (character c) 



