110 



Racial Studies in Fishes 



and of the six combinations noted above as found, not all were of the 

 same frequency. 



An attempt has been made to characterise the various larger regions 

 of sea within the Zoarces area by means of the average qualities of the 



a = 113-42 (±0-49). 



a = Ji5-^5(±0-43). 



118 



116 

 114 



112 

 110 



108 



Population 1916 



a = ii5-40(± 0-44). 



Fig. 4. Zoarces vivipants, L. Number of vertebrae. Population analyses for three 

 successive years from Station 31, Ise Fjord, Sealand, Denmark. 



