. The vertebrata of the Oligocene of the Cypress Hills, Saskatchewan [microform]. Vertébrés fossiles; Vertebrates, Fossil; Paléontologie; Paleontology. N«mIii and tutnia «if Mri/arrropt ii.«frmit, Hk. !» vu-wetl from aliuvf, fiu. 10 fnmi the front, Hg. 11 fmm the right aide. One- fourth the natural Mixe; figs. 10 and 11, after (^l», Meqacerops paiMiTivus, Sp. nov. Plate VI, figs. 4 and 6. In 1904 the writer was fortunate in securing, from theOligocene deposits of the Cypress hills, a mandible of a Titanothere that is of considerable interest. It is the most perfect lower jaw obtained so far fr
. The vertebrata of the Oligocene of the Cypress Hills, Saskatchewan [microform]. Vertébrés fossiles; Vertebrates, Fossil; Paléontologie; Paleontology. N«mIii and tutnia «if Mri/arrropt ii.«frmit, Hk. !» vu-wetl from aliuvf, fiu. 10 fnmi the front, Hg. 11 fmm the right aide. One- fourth the natural Mixe; figs. 10 and 11, after (^l», Meqacerops paiMiTivus, Sp. nov. Plate VI, figs. 4 and 6. In 1904 the writer was fortunate in securing, from theOligocene deposits of the Cypress hills, a mandible of a Titanothere that is of considerable interest. It is the most perfect lower jaw obtained so far from this locality, and is the type of the above named species. The specimen consists of both halves of the jaw. The left ramus is perfect, with the full number of teeth preserved ; the right ramus lacks the fourth premolar, and the molars, with that part of the alveolar border that held these teeth. The mandible is of fair si/.e, and belonged to an adnlt individual. It presents the follow- ing dental formula: I,, C,, P,, M,. There is a diastema behind the canine, a character which, taken in conjunction with the presence of three incisors and four premolars, is indicative of a somewhat primitive species. The chief characters displayed are: incisors, in three pairs,with a space between the inner pair; canines, of small diameter, apparently short; a diastema between the canine and the first premolar; first premolar, small; third premolar, becoming molaiiform, fourth premolar, molariform; symphysis, long ; symphyaial surface between canines, narrow; jaw contracted at the diastema; external cingala, moderately developed; internal cingula, wanting ; mental foramen, beneath the second premolar; coronoid process, short. Megaceropt avus (Marsh), from the Oligocene of South Dakota, has three pairs of inferior incisors but only three premolars below on each side, and there is a short <1iastema behind the lower canine. Its dimensions are greater than those of .1/. primitivas. The
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Keywords: ., bookcentury1900, bookdecade1900, booksub, booksubjectpaleontology
