24 25 26 27 28 29 30 



NUMBER OF ARTICULATE- DORSAL RAYS 



48 



49 



50 51 52 53 



NUMBER OF VERTEBRAE 



54 



55 



Figure 3. —Examples of overlap. A from Ginsburg (1938) showing 

 the approximate level of subspecific differentiation 

 in Cynoscion. B from Tester ( 19U9) showing very 

 closely related samples of herring from Vancouver Island 

 which had statistically significant differences in mean 

 numbers of vertebrae. The base line indicates the range, 

 the small triangle the mean x, the solid bar two standard 

 errors 2s on either side of the mean, and the hollow 



x 

 bar one standard deviation s on either side of the mean. 



16 



