138 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Group I. Modal lengths in the spring 

 in o n t li s (January-March). 



(1) Barrow Channel : 



Males, 18 cms. long; females, 18 cms. long. 



(2) Lime and Wyre : 



Males, IT cms. long; females, 17 cms. long. 



(3) Rock Channel : 



Males, IT'5 cms. long; females, 18 cms. long. 



,, Modal lengths in the autumn 



months (September to November). 



(1) Barrow Channel : 



Males, 19 cms. long; females, 19 cms. long. 



(2) Lime and Wyre : 



Males, 18 cms. long; females, 18*5 cms. long. 



(3) Hock Channel : 



Males, 19 cms. long; females, 19 cms. long. 



Group II. Modal lengths in the spring 



months. 



(1) Barrow Channel : 



Males, 23 cms. long; females, 23 cms. long. 



(2) Lime and Wyre : 



Males, 18*5 cms. loug; females, 21 cms. long. 



(3) Rock Channel: — 



Males, 21 cms. long; females, 21*5 cms. long. 



„ Modal lengths in the autumn 



months. 



(1) Barrow Channel : 



Males, 22 cms. long; females, 22 cms. long. 



(2) Lime and Wyre : 



Males, 24 cms. long; females, 22 cms. long. 



(3) Rock Channel : 



Males, 21 cms. long; females, 215 cms. long. 



The differences in the modal lengths of plaice taken 

 from these various grounds are very slight, and may be 

 expected to be less than the probable errors of the deter- 



