. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Fig. 8. Peripristis semicircularis (N. & W.). Chester Group, Kentucky. Upper tooth, in profile and front view, X j- in having the serrations of the cutting-edge obsolete, or nearly so, and the basal border deflected downward in the median line in front, as shown in Text- figure 7. It also has a longer root than the upper tooth. The coronal margin of the latter is always strongly serrated in the unworn condition (Text-fig. 8), there being usually four denticulations on one side of the median line and five
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Fig. 8. Peripristis semicircularis (N. & W.). Chester Group, Kentucky. Upper tooth, in profile and front view, X j- in having the serrations of the cutting-edge obsolete, or nearly so, and the basal border deflected downward in the median line in front, as shown in Text- figure 7. It also has a longer root than the upper tooth. The coronal margin of the latter is always strongly serrated in the unworn condition (Text-fig. 8), there being usually four denticulations on one side of the median line and five on the other. The coronal cavity of the upper tooth exhibits a deep pit in the median line at the junction of the horizontal and vertical portions of the posterior face, but there is no groove extending from it on either side as in P. falcatus. In one specimen, that shown in Plate 2, Fig. 7, the pit is de-. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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