. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. ELEPHANTID^l. 37 Mastodon pandionis, Falconerr. Syn. Tetrabelodon pandionis, Cope2. In this species the mandibular symphysis is produced into a long, deeply hollowed, trough-like expansion, which in some specimens is edentulous, but in others (which are apparently specifically identical) is furnished with a pair of large laterally compressed incisors 3, the mandibular rami being also compressed in the same direction. The cheek-teeth are relatively wide, and are normally characterized by the extreme co
. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. ELEPHANTID^l. 37 Mastodon pandionis, Falconerr. Syn. Tetrabelodon pandionis, Cope2. In this species the mandibular symphysis is produced into a long, deeply hollowed, trough-like expansion, which in some specimens is edentulous, but in others (which are apparently specifically identical) is furnished with a pair of large laterally compressed incisors 3, the mandibular rami being also compressed in the same direction. The cheek-teeth are relatively wide, and are normally characterized by the extreme complexity of the structure of the crowns, the accessory tubercles being very numerous, placed on both sides of the median longitudinal cleft, and completely blocking the valleys, although in some earlier " intermediate " molars provisionally referred to this species4 the valleys are more free. The ridges are divided into inner and outer columns, which have an alternate arrangement, and when worn do not present distinct trefoils of dentine. The third milk-molars provisionally referred to it are more complex than is usually the case with trilophodont species, and in this respect agree with those of M. penteliei; the third upper true molar is relatively K». ? Mastodon pandionis.—The fourth right upper premolar; from the Lower Siwaliks of Dera Bugti, north-west frontier of India. j. Indian Museum, Calcutta, No. A 432. (From the ' Palgeontologia Indica.') short; and the enamel of all the teeth is thrown into vertical plica- tions. It is probable that premolars were developed, at least in some instances 5, and a tooth provisionally so considered is figured in the accompanying woodcut (fig. 7). 1 Palseontological Memoirs, vol. i. p. 124 (1868). 2 Proc. Amer. Phil. Soe. toI. xxii. p. 5 (1884). 3 See ' Palaeontologia Indica ' (Mem. Geol. Surv. Ind.), ser. 10, vol. i. pi. xxxv. and Cat. Siwalik Vert. Ind. Mus. Calcutta, pt. i. pp. 99-101 [1885]). 4 ' Pakeontologia Indica,
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Keywords: ., bookauthorlydekker, bookcentury1800, bookdecade1880, bookyear1885
