Fig. 14. — Diagram contrasting heads of female Salmon and Sea-trout. 



(i) Head of female salmon. 

 (2) Head of female sea-trout. 



Fig. i5.^Diagram of gill-covers of Salmon-Trout, Grey Trout, and Salmon. 



{after Yarrcll^reversed). 



See pages 55 and 56. 



