. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. 384 TEE DE&GENT OF pip . 31. Plecostomus barbatus. Upper figure, head of male; lower figure. 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 : A. L. Burt

---

Size: 1332px × 1876px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear