. Bulletin - United States National Museum. Science. 110 BULLETIN 16 9, UNITED STATES NATIONAL MUSEUM ing Acmeodon, its outer wall looking as if it had been plastically de- formed, by pressing the apex outward. Except for details in the generic diagnosis or evident from the measurements, the lower molars so closely resemble those of Didelphodus absarokae, described by Matthew (1918), that further description of them is not necessary. There is a s;ingle left M^, no. 9554, from the Gidley Quarry, that may belong to this species, although it differs more markedly from Didelphodus absarok
. Bulletin - United States National Museum. Science. 110 BULLETIN 16 9, UNITED STATES NATIONAL MUSEUM ing Acmeodon, its outer wall looking as if it had been plastically de- formed, by pressing the apex outward. Except for details in the generic diagnosis or evident from the measurements, the lower molars so closely resemble those of Didelphodus absarokae, described by Matthew (1918), that further description of them is not necessary. There is a s;ingle left M^, no. 9554, from the Gidley Quarry, that may belong to this species, although it differs more markedly from Didelphodus absarokae than do the lower molars. It is remarkably short and wide, or extremely transverse, and further differs from Didelphodus in the great extension of the parastyle spur, the slightly more external position of paracone and metacone, and the vestigial character of the metaconule. It resembles Didelphodus in other respects, such as the emarginate outer border, shelf-like meta- a. Figure 12.—Oelastops parens Simpson, no. 6148: Right lower jaw, external view. Twice natural size. Figure Vi.—Gelastopsparens Simpson; a, Crown view of right lower teeth and alveoli, no. 9601; b, internal view of right lower jaw, no. 9850. Twice natural size. stylar extension, connate bases of paracone and metacone, and entire absence of hypocone or of anterior or posterior cingula. The trans- verse extension and the reduction of the metaconule are, furthermore, Didelphodus-like but here more extreme and the nonmarginal position of paracone and metacone are also Didelphodus-like but less pronounced. Table 22.—Measurements of individual specimens of Gelastops parous. no. P4 M 1 M J Ms M » L W L W L W L W L W 6148 . Mm Mm Mm Mm Mm Mm Mm Mm Mm Mm 9446 9850 9601 9554 .. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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