378 THE DE8GENT OF MAN. 



half an inch in length. With the European salmon, 

 according to Mr. Lloyd,* the temporary hook-like structure 



Fig. 27. Head of male common salmon (Salmo solar) during the breeding- 

 season. 



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

 cuted by the well-known artist, Mr. G. Ford, from specimens in the British 

 Museum, under the kind superintendence of Dr. Gunther.] 



serves to strengthen and protect the jaws, when one male 

 charges another with wonderful violence; but the greatly 

 developed teeth of the male American salmon may be com- 



* "Scandinavian Adventures," vol. i, 1854, pp. 100, 104. 



