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Chap. XII.
Fishes.
333

Salmo lycaodon of N.-W. America the change, as Mr. J. K. Lord[1] 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 (Salmo salar) during the breeding-season.

[This drawing, as well as all the others in the present chapter, have been executed by the well-known artist, Mr. G. Ford, from specimens in the British Museum, under the kind superintendence of Dr. Günther.]

the teeth grow into regular fangs, often more than half an inch in length. With the European salmon, according to Mr. Lloyd,[2] the temporary hook-like structure serves to strengthen and

  1. 'The Naturalist in Vancouver's Island,' vol. i. 1866, p. 54.
  2. 'Scandinavian Adventures,' vol i. 1854, pp. 100, 104.