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Plate I. SCALES 



A, ctenoid scale of 1 5-inch striped bass, in its third year, showing teeth on 

 exposed rear part of scale. By permission of E. C. Scofield and the Cali- 

 fornia Division of Fish and Game. 



B, cycloid scale of i z-inch trout, in its third year. The points i ana 2 on 

 this scale, as in A, mark the annual checks at the end of the first and of the 

 second year. 



