. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN : CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 179 1872. Peripnslin semicircularis O. H. St. John, Hayden's Final Rept. U. S. Geol. Surv. Nebraska, p. 242, PI. III., Figs. 3, 4, Tl. IV., Fig. 20. 1875. Ctenopti/ckius semicircularis J. S. Newberry, Kept. Geol. Surv. Ohio, Vol. II., p. 52, PI. LVIII., Fig. 14. 1902. Peripristis semicircularis C R. Eastman, Geol. Mag. (IV.), Vol. IX., p. 389, Text-fig. 1. It is evident from marks of contact that the relations between tlie supposed upper and lower teeth of
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. EASTMAN : CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 179 1872. Peripnslin semicircularis O. H. St. John, Hayden's Final Rept. U. S. Geol. Surv. Nebraska, p. 242, PI. III., Figs. 3, 4, Tl. IV., Fig. 20. 1875. Ctenopti/ckius semicircularis J. S. Newberry, Kept. Geol. Surv. Ohio, Vol. II., p. 52, PI. LVIII., Fig. 14. 1902. Peripristis semicircularis C R. Eastman, Geol. Mag. (IV.), Vol. IX., p. 389, Text-fig. 1. It is evident from marks of contact that the relations between tlie supposed upper and lower teeth of this species are identical with those known to obtain in P. falcatuSy a specimen of the latter having been found which displays the. Fig. 7. Peripristis semicircularis (N. & W.). Chester Group, Kentucky. Lower tooth, in profile and front view, X J. dental plates of both jaws in natural association. The tooth which may be provisionally referred to the lower jaw in all these forms is the one which fitted inside that of the opposite jaw when the mouth was closed, this condition having been ascertained to hold in the case of Janassa, and being true among sharks generally. Tlie lower tooth of P. semicircularis differs from the upper. 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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