Abstract
IN the course of a study of the European Hipparion1, it was found that the ratio of the length of the molar series to the length of the premolar series (M/P) is fairly constant within that genus. It ranges from 76.7 to 91 (M/P × 100) in thirty-eight specimens of upper tooth-rows from Pikermi and Salonica, most values falling between 80 and 89. It appears to be independent of the length of the tooth-row.
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References
Pirlot, P. L., “A Study of the European Hipparion”, University of London, Ph.D. thesis, 1948 (unpublished).
Osborn, H. F., Mem. Amer. Mus. Nat. Hist., N.S., 2, Pt. 1 (1918).
Osborn, H. F., U.S. Geol. Survey, Mon. 55, 2 vol. (1929).
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PIRLOT, P. The Ratio Molars/Premolars in Perissodactyls. Nature 171, 972–973 (1953). https://doi.org/10.1038/171972a0
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DOI: https://doi.org/10.1038/171972a0
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