. The descent of man : and selection in relation to sex . Evolution; Natural selection; Heredity; Human beings. Fig. 33. Sitana minor. Male with the gular pouch expanded (from Gunther's 'Reptiles of India'). Fig. 34. Ceratophora Stod. dartli. Upper figure, male; lower figure, fe- male>. as the head. It is cylindrical, covered with scales, flexible, and apparently capable of erection: in the female it is quite rudimen- tal. In a second species of the same genus a terminal scale forms a minute horn on the summit of the flexible appendage; and in a third species (C. Stoddartii, fig. 34) the wh
. The descent of man : and selection in relation to sex . Evolution; Natural selection; Heredity; Human beings. Fig. 33. Sitana minor. Male with the gular pouch expanded (from Gunther's 'Reptiles of India'). Fig. 34. Ceratophora Stod. dartli. Upper figure, male; lower figure, fe- male>. as the head. It is cylindrical, covered with scales, flexible, and apparently capable of erection: in the female it is quite rudimen- tal. In a second species of the same genus a terminal scale forms a minute horn on the summit of the flexible appendage; and in a third species (C. Stoddartii, fig. 34) the whole appendage is con- verted into a horn, which is usually of a white color, but assumes a purplish tint when the animal is excited. In the adult male of this latter species the horn is half an inch in length, but it is of quite minute size in the female and in the young. These appen- dages, as Dr. Giinther has remarked to me, may be compared with the combs of gallinaceous birds, and apparently serve as orna- ments. " All the foregoing statements and quotations. In regard to Cophotis, Sitana and Draco, as well as the following facts in regard to Cerato- phora and Chamaeleon, are from Dr. Gunther himself, or from his magnificent work on the 'Reptiles of British India,' Ray Soc. 1864, pp. 122, 130, 135. »« Mr. Swinhoe, 'Proc. Zoolog. Soc' 1870, 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 : Merrill and Baker
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