. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. XH. Fishes. 333 Salmo lycaodon of America the change, as Mr. J. K. Lord8 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. 21. Head of male common salmon (Salmo safcw) during the breeding-season. TThis drawing, as well as all the others in the present chapter, have been executed by the well-known artist, Mr. G. Ford, from specimens
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. XH. Fishes. 333 Salmo lycaodon of America the change, as Mr. J. K. Lord8 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. 21. Head of male common salmon (Salmo safcw) during the breeding-season. TThis 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. Gtother.] fche teeth grow into regular fangs, often more than half an inch in length. With the European salmon, according to Mr. Lloyd,9 the temporary hook-like structure serves to strengthen and 8 < The Naturalist in Vancouver's 9 * Scandinavian Adventures,* vol Island/ vol' 1866, p 54. i. 1854, pp. 100, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. London, J. Murray
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