. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 47, Part 3, 1948. 250 295 Lenqi-h ,mm. PLATE 20 Frequency distribution of the lengths (maximum) of 112 metatarsals of Equus occidentalis, ranging in length from 279 mm. to 311 mm. isting in the caliber of the metapodials in the male horse is not generally evident in the other long bones of the limbs, with the possible exception of the phalanges. In the draft horse, at least, the hoof bones are distinctly broader in stallions than in mares. No attem
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 47, Part 3, 1948. 250 295 Lenqi-h ,mm. PLATE 20 Frequency distribution of the lengths (maximum) of 112 metatarsals of Equus occidentalis, ranging in length from 279 mm. to 311 mm. isting in the caliber of the metapodials in the male horse is not generally evident in the other long bones of the limbs, with the possible exception of the phalanges. In the draft horse, at least, the hoof bones are distinctly broader in stallions than in mares. No attempt has been made to determine the sex of the bones of the third or ungual phalanx in E. occidentalis, since the coeffici- ents of variation for measurements of this element show only moderately high values. An index useful in showing further the sexual differentiation of the metapodials in E. occidentalis is the ratio of measurement number 3 to measurement number 5. If the maximum proximal width of the metacarpus be assumed as , the minimum width of the shaft in males is, on the average, , ranging in 37 speci- mens from to In female the average index is only , ranging in 37 specimens from to The same male su- periority in the thickness of the shaft relative to the ends of the bone is presented in metapodials of modern domestic horses. This thickness of the mid-shaft relative to the widths of the ends is, however, noticeably greater in E. occidentalis than in most speci- mens of living horses. Thus the metapodials of the Rancho La Brea horse may be described as of more uniform caliber, with less 91. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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