. Bulletin of the Department of Geology. Geology. 1917] Stock: Skull and Dentition of Nothrotherium 141 by Reinhardt13 differs noticeably from the Californian form in dorsal contour of skull (fig. 2). It is possible that this difference is in part due to age, but it is probably a specific distinction. In Hapalops longiceps the frontal is more elevated than the parietal, while in H. vulpiceps and H. graciUdens the reverse is true, the parietal being much more highly vaulted than the frontal. In the elevation of the frontal the Rancho La Brea species of Nothrotherium approaches Planops most clos
. Bulletin of the Department of Geology. Geology. 1917] Stock: Skull and Dentition of Nothrotherium 141 by Reinhardt13 differs noticeably from the Californian form in dorsal contour of skull (fig. 2). It is possible that this difference is in part due to age, but it is probably a specific distinction. In Hapalops longiceps the frontal is more elevated than the parietal, while in H. vulpiceps and H. graciUdens the reverse is true, the parietal being much more highly vaulted than the frontal. In the elevation of the frontal the Rancho La Brea species of Nothrotherium approaches Planops most closely. MegaLonyx differs from its Pleistocene con- temporary in the straight dorsal contour of the skull. The zygomatic process of the squamosal is long and slender. It is relatively longer than in H. longiceps. In skull 15, used as the type in the first description14 of the species from Rancho La Brea, this Fig. 2. Nothrotherium sliastcnse Sinclair. Cranium, no. 208 M. H. S. A., lateral view, X %• Rancho La Brea Beds, California. process is broken. The malars have been preserved in several skulls, notably in no. 208, where they are firmly attached at the base to lachrymal and maxillary. The malar resembles Hapalops in slender- ness, and, as in that genus, is not fused with the zygomatic process of the squamosal. It differs from H. longiceps in (1) its relatively shorter anteroposterior extent, (2) an absence of a marked outward flare of the infraorbital border, (3) a shorter dorsal prong, but deeper notch for the zygomatic process of the squamosal, and (4) a relatively longer and more slender ventral prong. 13 Reinhardt, J., Kaempedovendyr-Slaegten Coelodon, Vidensk. Selsk. Skr., 5 Raekke, naturvidenskabelig og mathematisk Ar'handl., vol. 12, 3, pp. 253-310, 5 pis., Copenhagen, 1878. i-t Stock, C, op. cit., pp. 342-350, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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