. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Fig. 30. Xiphophorus Hellerii. Upper figure, male; lower figure, female. In the very distinci; family of the Cyprinodoutidse—inhabitants of the fresh waters of foreign lands—the sexes sometimes differ much in various characters. In the male of the MolUeuesia petenensis,'^^ the dorsal fin is greatly developed and is marked '6 With respect to this and the following; species I am indebted to Dr. Giinther for information: see '3 'Nature,' July 1873, p. 264. ** ' Catalogue of Acanth. Fishe
. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Fig. 30. Xiphophorus Hellerii. Upper figure, male; lower figure, female. In the very distinci; family of the Cyprinodoutidse—inhabitants of the fresh waters of foreign lands—the sexes sometimes differ much in various characters. In the male of the MolUeuesia petenensis,'^^ the dorsal fin is greatly developed and is marked '6 With respect to this and the following; species I am indebted to Dr. Giinther for information: see '3 'Nature,' July 1873, p. 264. ** ' Catalogue of Acanth. Fishes in the British Museum,' by Dr. Giinther, 1861, pp. 138-151. ^^ * Game Birds of Sweden,' & 1867, p. 466. also his paper on the 'Fishes of Central America,' in 'Transact. Zoolog. Soc' vol. y\. 1868, p. 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. New York : D. Appleton and Company
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
