. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 196 MABSTJPIALIA. ridged, although in the genus Liotomus, Cope^ they are smooth ; their number varies from one {Neoplagiaulax) to four {Plagiaulax minor and Ctenacodon) ; the lower true molars are two in number, of small size, and marked by one longitudinal groove. The upper true molars of the European and North-American genus Neopla- Fig. Ftilodus medicBVus, Cope,âThe left ramus of the mandible, from the outer (a), inner {h), and oral (c) aspect; from the Puerco Eocene of New Mexico. \. (From th
. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 196 MABSTJPIALIA. ridged, although in the genus Liotomus, Cope^ they are smooth ; their number varies from one {Neoplagiaulax) to four {Plagiaulax minor and Ctenacodon) ; the lower true molars are two in number, of small size, and marked by one longitudinal groove. The upper true molars of the European and North-American genus Neopla- Fig. Ftilodus medicBVus, Cope,âThe left ramus of the mandible, from the outer (a), inner {h), and oral (c) aspect; from the Puerco Eocene of New Mexico. \. (From the ' Amer. Nat.') giaulax have three ridges ^ (fig. 29). The mandible of the closely allied North-American Ptilodus is represented in fig. 30; in that genus a minute pm. 3 is present, and the other slight characters by which it is distinguished from Neoplagiaidax are mentioned by Lemoine ^ Genus PLAGIAULAX, Falconer". Including PUoprion, Cope ^. Dentition :~V-^-^, C.^, Pm. ^^, M.|. The lower premolars are obliquely grooved and ridged, and increase gradually in size from the first to the last (woodcut, fig. 31). The condyle of the mandible (as in Thylacoleo) is placed below the level of the alveolar line of the cheek-teeth. ^ Amer. Nat. vol. xviii. p. 691 (1884), = Neoplagiaulax marski, Lemoine. 2 From its resemblance to Bolodon, and the difference of its premolars from those reierred by Lemoine to the upper jaw of Neojjlagiaulcuv, the writer regards t})e maxilla figured by Marsh (Amer. Journ. 1887, pi. viii. figs. 2, 3) nsCtena- codon as probably belonging to the Bolodontida. â¢' Bull. Soc. Geol. France, ser. 3, vol. xi. p. 271 (1883). â * Quart. Journ. Geol. Soc. vol. xiii. p. 2()1 (1857). « Amer. Nat. vol. xviii. p. 691 (1884).. 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 British Museum (Nat
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