LiULL. U. S. B. v., VJ2S. (Due. 1053.) 



Fig. 19.— Scale uf Lake Iliiroii heiiinti i/j. 'iitnln t.^kcu WrLubfi -'7. I'Jiil. al. Hay City, Mich. (Saginaw- 

 Bay.) University of Michigan Museum No. 54:3i;-i. Length, 210 millimeters. Male. Age HI. 

 Scale shows two completed annul! antl a marginal growtli 



Fig. 20.— Scale of Lake Huron herring (L. artfdi) taken October 2\i, 1921. at Bay City, 

 Mich. (Saginaw Bay). University of Michigan Museum No. 54703. Length, 245 

 millimeters, ^^aturemale. AgelH. Scale shows two completed annul! and a marginal 



growth 



