Hull. V. 8. B. V., 1928. (D- c 1().":V> 



Fig. 21.— Scale of Lake Huron nerring {L. artedi) taken September JO, 1917, at Alpena. Mich. 

 I'niversity of Michigan Museum No. 52195. Length, 175 millimeters. Age III. Scale shows 

 two completed annuli and a marginal growtli 



Fm. 22.— Scale of Lake Huron herring (L. artedi) taken July 17. 1917. at St. Ignace, Midi. Length, 

 212 millimeters. Male. Age IIL Scale shows two completed annuli and a marginal growth 



