(I) 



Fie. 



14. 



-Diagram contrastino- heads of female Salmon and Sea-trout. 



(i) Head of female salmon. 

 (2) Head of female sea-troul. 



F\g. 15. — Diagram of gill-covers of Salmon-Trout, (irey Trout, and Salmon. 



[afier Yarrell^reversed). 



See pages 55 and 56. 



