8 ESDAILE, Scales of tliree Spcciuictis of Sabiio sa/ar, 



position, which were useful for purposes of examination. 

 Very often three or four of the annuli at the centrum 

 seem to be missing, and these scales were discarded as 

 imperfect. It was most disappointing, therefore, to find 

 that on the fish from which scales had been taken from 

 fourteen different positions, neither set of scales from one 

 side or the other was complete enough for careful 

 examination, and therefore we cannot verify the results 

 obtained from the one scale from each position. Positions 

 (4j and (8) (See Diag. i) are the most difficult regions 

 from which to obtain useful sets of scales. 



Again, through the kindness of Mr. Hutton, further 

 work on this part of the scale problem was rendered 

 possible. Mr. Hutton collected scales from seven 

 positions of a i/lb, fish. (See Diag. i, Fig. 2.) This 

 was a freshly run female fish caught on February 2nd, 

 191 1, at Hampton I^ishop, on the Wye; its length was 

 35" and its girth 18". The seven sets of scales were 

 mounted in the manner already described, and the 

 number of annuli per period was ascertained at the 

 long axis and at 30'' to the left and right ; and the 

 length in millimetres of each period was also measured 

 along the long a.xis. Wherever possible, ten scales 

 were examined from each position. From position (4) 

 however, only three scales were perfect enough to 

 use. The averages of the results obtained from so 

 small a number are not very trustworthy evidence, 

 but they are all that is at hand for the present. The 

 averages of the results obtained are to be found in 

 Table 2. The great variations in the number of annuli 

 and in the lengths per period are at once noticed. But 

 what is most interesting, though it cannot be shown 

 because of lack of space, is the variation of the scales 

 from each position. Taking, for example, the scales from 



