. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 2 Peterson : A Small Titanothere from the Uinta Beds. 55 poitions found generally in the Eocene Titanotheres. The deciduous cheek-teeth are three in number and theii increase from first to last is unusually rapid. The crowns of the first and second deciduous cheek-teeth are broken ofT, but the gi eater part of the last tooth is preserved. The piincipal feature of this tooth is the piesence of two large internal tubercles which aie conical in shape and covered with a heavy coating of enamel. T
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 2 Peterson : A Small Titanothere from the Uinta Beds. 55 poitions found generally in the Eocene Titanotheres. The deciduous cheek-teeth are three in number and theii increase from first to last is unusually rapid. The crowns of the first and second deciduous cheek-teeth are broken ofT, but the gi eater part of the last tooth is preserved. The piincipal feature of this tooth is the piesence of two large internal tubercles which aie conical in shape and covered with a heavy coating of enamel. The antero-external angle of the tooth is extensively developed, so that the antero-posterior diameter is considerably greater than the transverse. M- is just ap- „ , , , 1111 11 ^l<^- 2. Heleroiilanops pearing through the alveolar bordei and has ^^^^„^ Peterson. (Type, been freed for the purpose of study. The No. 2909.) x |. proto- and hypocones usually found in the i. Deciduous dentition Titanotheres aie piesent, and well developed, ^^'^ permanent M ; 2, while the external face of the ectoloph is less " ^' concave fore-and-aft and the median vertical ridge has a somewhat greater forward projection than is generally the case in the Titano- theres. The germ of M- is quite well advanced, while that of M- has apparently not yet been formed. The first lower cheek-tooth is seen buried in the ramus, but is not represented in the illustrations. D-^- and D are injured while My is well preserved. Its crown is like that of the typical Eocene Titano- theres and needs no description. My is well advanced towards maturity while M-g- is not yet indicated. Measurements. Mm. Total length of skull from canine to and including the occipital condyle. . 142 Transverse diameter of skull at the parietal region 46 Greatest transverse diameters of frontals 54 Length of alveolar border, canine to and including M~ 67 Length of deciduous cheek dentition 38 Antero-posterior diameter of D- 21 Tr
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