Table 2.— The total number of gill rakers in the sexes in a aample from 72 to 



198 mm. S.L. taken in the Delaware Riyer, New Jersey on October 9, 1952. 



Total No. Gill Rakers 

 Sex 25 24 25 26 27 Nc . Me&n S( X - x)- 



Male 3 17 13 13 3 h-9 2h,91d "',0',-, 



Female 6 6 12 7 = 31 -.045 33.097 



t = 1.13, N.S. 



17 



