. Bulletin - American Museum of Natural History. Natural history; Science. 44 Bulletin American Museum of Natural History. [Vol. VII,. Fig. 14. Pantolambda bathmodon of superior molars. Natural size. Crown view is typical ; the peculiar features of the superior molars are that although they present a broad transverse triangle, the apices of the three primary cusps (protocone, paracone and metacone) are brought close together as in the Periptychus, while the outer wall is very broad, exhibiting a parastyle and a metastyle, both well developed, while the mesostyle is feeble ; the intermediate co
. Bulletin - American Museum of Natural History. Natural history; Science. 44 Bulletin American Museum of Natural History. [Vol. VII,. Fig. 14. Pantolambda bathmodon of superior molars. Natural size. Crown view is typical ; the peculiar features of the superior molars are that although they present a broad transverse triangle, the apices of the three primary cusps (protocone, paracone and metacone) are brought close together as in the Periptychus, while the outer wall is very broad, exhibiting a parastyle and a metastyle, both well developed, while the mesostyle is feeble ; the intermediate conules are also feebly developed or absent. The third superior molar exhibits a very large parastyle, making the outer border asymmetrical and foreshadowing the oblique development of the outer wall of this tooth in Coryphodon. The first upper premolar is single- rooted, while the second, third and fourth each have three roots; and, although the crowns are wanting, this demonstrates the presence of a strong internal cone. The fourth premolar exhibits a single deeply crescentic external cusp (protocone) and a strong crescentic internal cone (deuterocone) with feebly marked conules. The canines are directed outwards and laterally compressed. The dental series is continuous, as in the type of this species, while in the larger species, P. cavirictus, there is a considerable diastema behind the canines. The skull is of a very ancient type, exhibiting the following primitive characters: The anterior nares are terminal in position ; the front border of the maxilla descends vertically, and the pre- maxilla, which is broken away in these specimens, was apparently short. The cranium is twice as long as the face ; the brain-case proper is low and broad transversely; it is surmounted by a sharp sagittal crest and flanked posteriorly by lateral occipital <rcsts; the occiput is, therefore, very broad and low, as in Perip- tychus, in lateral view. We observe that the zygomatic arches are ve
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