. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PKENTISS : POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 265 wedge-shaped and divided into two facets of nearly equal size, the radial for articulation with metacarpal ii, the ulnar for the large process of metacarpal iir. The os magnum articulates distally with the third meta- carpal only ; the unciform has distally a small facet for the ulnar pro- cess of metacarpal iii, a large one for metacarpal iv, and a small facet laterally placed for metacarpal v. lun. III. Fig. G. — Left manus of Ancodus brachyrhynchus, sh
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PKENTISS : POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 265 wedge-shaped and divided into two facets of nearly equal size, the radial for articulation with metacarpal ii, the ulnar for the large process of metacarpal iir. The os magnum articulates distally with the third meta- carpal only ; the unciform has distally a small facet for the ulnar pro- cess of metacarpal iii, a large one for metacarpal iv, and a small facet laterally placed for metacarpal v. lun. III. Fig. G. — Left manus of Ancodus brachyrhynchus, showing carpals and metacarpals. i-v, first to fifth metacarpals; lun., hmar; os mng., os magiuim; scph., scaphoid; trz., trapezium; irztZ., trapezoid; ««., unciform. § natural size. (After Scott.) If we compare the carpus and metacarpus of the pig with those of fossil swine (Palaeochoerus and Hyopotamus or Ancodus) figured hy Kowalevsky ('73) and Scott ('95), we find some remarkable differences. In Hyopotamus (Ancodus of Kowalevsky) the trapezium (Fig G.) is nearly as large as the trapezoid, and articulates superiorly with the scaphoid, iuferiorly with the metacarpal of digit i. The trapezoid has. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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