924 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
fit the original observations much better than do those 
calculated from w=k 13; and if the two curves be plotted 
together it will be seen that the difference is too great to 
admit of the latter equation being used for calculations 
requiring accuracy of result. 
A catch of 134 plaice from Beaumaris Bay, 
43th July, 1940. 

Mean Length Average Weight a= a y =0-00523-227 
(x) (y) 
16-5 45-5 45:3 41-6 
17-5 50-2 54-1 50:3 
18-5 61-7 63-9 60-1 
19-5 68-3 - 74-9 71-2 
20:5 84-1 87-0 83:7 
21:5 97-0 LOS ee 97-6 
22:5 115-4 115-0 112-2 
23°5 130-0 131-0 124-9 
24:5 147-3 148-5 148-6 
25:5 183-7 167-4 169-0 
26:5 194-2 187-9 191-3 
27:5 209-3 210-0 215-6 
28-5 229-8 233-8 241-8 
29-5 267-9 259-3 270°3 
30:5 295-0 286-5 300-8 
31-5 345-0 315-7 333°8 
32:5 358-0 346-7 369-1 
33:5 407-2 379-7 407-0 
34:5 467-0 414-7 447-4 
35:5 503-0 451-8 - 490-5 
36:5 529-0 491-1 536-5 


Total... ...1 4,788 | 4,565 4,763 
