Proceedings of the United States National Museum (1878)
United States National Museum, Smithsonian Institution, United States. Dept. of the Interior · Washington : Smithsonian Institution Press, [etc.] · leaf 613
s ob- served the hinder border of the anterior style is not at all or only slightly rolled backward. In the Arabian horse skull (No. 172454, National Museum) the border turns rather strongly backward. In the type of ZL. niobrarensis it is not at all rolled backward. Probably in each species there… … Fic. 3.—LOWER PREMOLARS (@) AND LOWER MOLARS (b) OF EQUUS HATCHRRI. Xs. of the protocone is divided by a distinct groove into an anterior lobe and a larger posterior one. In the domestic horses the inner face of the protocone is usually, but not always, either flat or somewhat concave. . As regards…
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