Chap. XIL 



Fishes. 



333 



&dmo lycaodon of N,-W. America the change, as Mr. J. K. Lord' 

 believes, is permanent, and best marked in the older males which 

 have previously ascended the rivers. In these old males the 

 jaw becomes developed into an immense hook-like projection, and 



Fig. 27. Head of male common salmon (SaZmo saktr) during the breeding-season, 



[This drawing, as well as all the others in the present chapter, have been executed 

 Dy the well-known artist, Mr. CJ. Ford, from specimens iu the British Museum, under 

 the kind superintendence of Dr. Uilnther.] 



the teeth grow into regular fangs, often more than, half an inch 

 in length. With the European salmon, according to Mr. Lloyd,' 

 the temporary hook-like structure serves to strengthen and 



^ ' The Naturalist in Vancouver's 

 Island,' vol. i. 1S66, p 54. 



' ' Scanlinivian .\dventui'es,' vol 

 i. 185+, pp. 100, 104. 



