. Bulletin - American Museum of Natural History. Natural history; Science. 1 2 3 Fig. 20. Protogonodonpentacus. Left lower jaw. Superior and external view. Natural size. all the molars, which extends completely across the external face of the teeth. The intermediate tubercles are strongly marked, and they have spurs which run outwards and join the anterior and posterior cingula respectively. The protocone is large and placed at the internal end of the median valley, and at an equal distance between the outer lobes. The protocone, like the inter- mediate tubercles, has crests running outwards f
. Bulletin - American Museum of Natural History. Natural history; Science. 1 2 3 Fig. 20. Protogonodonpentacus. Left lower jaw. Superior and external view. Natural size. all the molars, which extends completely across the external face of the teeth. The intermediate tubercles are strongly marked, and they have spurs which run outwards and join the anterior and posterior cingula respectively. The protocone is large and placed at the internal end of the median valley, and at an equal distance between the outer lobes. The protocone, like the inter- mediate tubercles, has crests running outwards from it, and when the teeth are much worn these elements of the crown unite, and as a result there is formed a well-marked internal crescent. The first superior molar is square in outline, with its internal cingulum in- complete ; the second has the cingulum more developed than in the first, and in the third it is complete. In strong contrast to some of the other Puerco forms, the upper molars of Protogonodon can be said to be without hypocone; only on the first and second molars is there any rudiment of the hypocone upon the posterior eingu-. 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 American Museum of Natural History; Allen, J. A. (Joel Asaph), 1838-1921. New York [American Museum of Natural History]
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
