Bull. U. 8. B. F., 102S. (Doc. 1053.) 



Fici. 27.— Scale of Lake Huron herring (L. nrfnii} taken July 17. 1917, at St. Ignure. IMk-h. 

 Length, 220 millimeters. Male. Age IV. Scale shows three completed annuli anii a 

 marginal growth 



Fig. 2K.— Scale of Lake Huron herring (h- nrtxli) taken Oclnher 2. liM'J. at Tobermory, Ontario. 

 Length, 209 millimeters. Age V. Scale shows fiiur cumpleteil annuli an.i a marginal growth 



