196 TRANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



July.— Under 18'8 cms. (7± in.) 15 % ; over 226 cms. 

 (9 in.) 35 % ; between 18'8 and 22"6 cms. 50 %. 



August. — Under 18'4 cms. (7J in.) 10 % ; over 22 cms. 

 (8} in.) 40 %; between 18'4 and 22 cms. 50 %. 



September. — Under 19 cms. (jl\ in.) 23 %; over 

 26'3 cms. (10| in.) 27 %; between 19 and 263 cms. 

 50 %. 



October.— Under 183 cms. (1\ in.) 335 %; over 

 25'8 cms. (10J in.) 165 %; between 18*3 and 

 25'8 cms. 50 %. 



November. — Under 19*7 cms. (7| in.) 10 % ; over 

 28'4 cms. (llj in.) 27 % ; between 197 and 28'4 cms. 

 50 %. 



December. — Under 19 cms. (7-| in.) 10 % ; over 25*4 cms. 

 (10 in.) 40 % ; between 19 and 25*4 cms. 50 %. 



January.— Under 207 cms. (8 in.) 24 %; over 29'8 

 cms. (11 1 in.) 26 % ; between 207 and 29'8 cms. 

 50 %. 



Now, if we compare this summary with those relating 

 to the other grounds (see Table XXVI) we see that the 

 half of all the fish taken lie between mean lengths of about 

 18*8 and 25 '2 cms., when these fish are taken from the 

 immediate neighbourhood of the modes (or of the means 

 when the distributions are bi-modal). The mean range 

 of the fish of this group is, therefore, nearly twice that of 

 the corresponding ranges in the cases of the other two 

 fisheries. This is not due alone to the greater modal (or 

 mean) values of the distributions, for the mean modal-mean 

 length for the Beaumaris-Eed Wharf grounds is at 21*8 

 cms., while that for the Mersey offshore ground is at 

 20*3, and that for the Nelson Buoy ground at 19'5 cms. 

 What we see in the North Wales fishery is a plaice popula- 



