. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 275 Metacarpal in has scarcely any radial enlargement at its proximal end and does not articulate with the trapezoid. Turning now to the musculature of these cases in which the super- numerary digit is composed of three phalanges, we find that in every ext. mfcarp. I——cxt. mt'carp. ob. com. dg. i. Fig. 0. — Anterior view of left polydactyle manus of the pig, showing extensor muscles. ext. com. dg. t., extensor communis digitorum iuternus; ext. mt'carp. mag., e
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 275 Metacarpal in has scarcely any radial enlargement at its proximal end and does not articulate with the trapezoid. Turning now to the musculature of these cases in which the super- numerary digit is composed of three phalanges, we find that in every ext. mfcarp. I——cxt. mt'carp. ob. com. dg. i. Fig. 0. — Anterior view of left polydactyle manus of the pig, showing extensor muscles. ext. com. dg. t., extensor communis digitorum iuternus; ext. mt'carp. mag., extensor meta- carpi magnus; ext. mt'carp. ob., extensor metacarpi obliquus; , extensor proprius poilicis et indicis; ext. pip. i., extensor proprius internus. iS natural size. case the extensor metacarpi obliquus (Fig. 0, ext. vit'carp. ob.) has shifted its insertion from the second to the first metacarpal; the ex- tensor proprius poilicis et indicis (Fig. 0, ext. prp.), which normally is extremely rudimentary, is in two cases inserted into the distal phalanges of digit i. VOL. XL. — KO. 6 8. 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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