136 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



that followed the partial cessation of fishing which occurred 

 during the years 1914-1918. 



The arrangement of the data is as follows : — 



Tables 3 to 10 record the lengths of plaice caught in a 

 trawl-net of 6-inch mesh, throughout the year, on the regions 

 Luce Bay, Morecambe Bay, etc., Blackpool to Liverpool Bar, 

 Mersey Estuary, Beaumaris and Red Wharf Bays, etc., 

 Carnarvon Bay and Cardigan Bay. The actual frequencies of 

 occurrence of each one-cm. group and the frequencies per 

 thousand are given. 



Table 11 gives the same kind of data for plaice caught 

 of! the Mersey Estuary in a shrimp trawl-net of 2-inch mesh. 



Table 12 gives the same data for a number of hauls made 

 with trawl-nets of 4-inch, 6-inch, and 7-inch meshes on the same 

 grounds and at about the same times. 



Table 13 gives the dispersions, calculated by the methods 

 indicated in the previous section of this report, for the distribu- 

 tions of Tables 3 to 12. 



