The rise of Mammalia in North America

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Abstract
ll. F. Osbol'n-Jllammalia in North Amerioa.449 porting three cusps, as found in the Oretaceous.Oonsider the extreme antiquity of the three homologous cusps borne upon the back part of the human molar.This addition gave the opposed molars two shears and one crusher, and was so perfectly adapted to the needs of Lemurs and many Insectivores and Oal'Ilivol'es, in short, of most clawed animals, that they stopped at this point.Not so with the I-Ierbivora, which required more extensi ve crushing surfaces.The upper molars, which had remained triangular through the Oretaceous and into the basal Eocene, began to develop a little talon, like thatHistory of the Cusps of the Ungulate Jlolars.Up])e,' molars in heavy lines, lower in light lines.A, Reptilian Stage.Haplodont, Permian.B. Protodont Stage (Dromotherium), Trias~ic.C, Triconodont Stage (Amphiles/es).D. Tritllberclllar Stage (Spala-cotheri1t1n.E. Tritllbercular-tl,bm'clIlo Sectorial (clmphitherium)
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Authors Henry F. Osborn
Journal american journal of science
Year 1893
DOI
10.2475/ajs.s3-46.276.448
URL
https://doi.org/10.2475/ajs.s3-46.276.448
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