. Bulletins of American paleontology. 138 Bulletin 156. Hypoprion greyegerioni, Figs. 48-52, 55. Upper teeth. 50 and 52. Holotype, from right side, remainder from left and shows inner face. (, ). 53,54,56. Lower teeth from left side. 56a. Side view (, , ). All teeth from upper Eocene, Clarke County, Alabama. X 1 1/3. The upper crowns are all somewhat asymmetrical and inclined to the rear, this margin beingi straight and the other curved, while the tips of the crown particularly of the foremost is much twisted; but both inclination and twist disappear
. Bulletins of American paleontology. 138 Bulletin 156. Hypoprion greyegerioni, Figs. 48-52, 55. Upper teeth. 50 and 52. Holotype, from right side, remainder from left and shows inner face. (, ). 53,54,56. Lower teeth from left side. 56a. Side view (, , ). All teeth from upper Eocene, Clarke County, Alabama. X 1 1/3. The upper crowns are all somewhat asymmetrical and inclined to the rear, this margin beingi straight and the other curved, while the tips of the crown particularly of the foremost is much twisted; but both inclination and twist disappear towards the middle of the series. There are no posterior upper teeth. The lower teeth have rather narrower and more upright crowns. The roots of the front teeth are short, but the length increases in the lateral teeth, and as it happens, so does the height of the crowns. Revfiarks.—The form of the upper teeth varies greatly according to the living species, as witness those of the type species , (see Miiller & Henle, 1841, pis. x, xix) and (see Bigelow & Schroeder, 1948, text fig. 54), particularly in the size of the basal denticles. The only common factor in the various dentitions is that basal denticles are present in the upper teeth and not in the lower, all crowns being smooth. This denticular fea- ture has almost disappeared (or had not developed) in the new fossil species, but the crowns of individual teeth do much resemble certain of those of th<." more obviously denticulated Eocene species from Nigeria, White (1928, p. 39, pi. ix, figs. 1-16). It. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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