. Bulletin of the British Museum (Natural History), Geology. 400 A. W. GENTRY. Fig. 19 Gomphotherium cooperi. Occlusal view of right M3, , from Ad Dabtiyah. Anterior side of the right, x 0-75. are alleged to be small; this is obviously true in relation to their own lower tusks, but less so in relation to Gomphotherium upper tusks (Osborn 1936; compare figs 416 A2 and 436). Another feature of amebelodonts is the narrowness of their molars and Tobien (1973: fig. 9) demon- strates this as between Asiatic Platybelodon and European and North American Gom- photherium. Also considered helpful
. Bulletin of the British Museum (Natural History), Geology. 400 A. W. GENTRY. Fig. 19 Gomphotherium cooperi. Occlusal view of right M3, , from Ad Dabtiyah. Anterior side of the right, x 0-75. are alleged to be small; this is obviously true in relation to their own lower tusks, but less so in relation to Gomphotherium upper tusks (Osborn 1936; compare figs 416 A2 and 436). Another feature of amebelodonts is the narrowness of their molars and Tobien (1973: fig. 9) demon- strates this as between Asiatic Platybelodon and European and North American Gom- photherium. Also considered helpful is the development of posterior conules on the posttrites which may give rise to a more fully trefoil pattern as on the pretrites. Tassy (1979: 267; 1983ft: 466) referred Protanancus macinnesi Arambourg of the lower Middle Miocene of Maboko, Kenya, to the Amebelodontinae. Its molars are certainly nar- rower than in European Gomphotherium and sometimes there is an indication of posterior conules on the posttrites (Maclnnes 1942: pi. 4, fig. 2). Moreover somewhat widened lower tusks are known from Maboko. Tassy (1979: 267) took the mastodon of the Lower Miocene of. 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 (Natural History). London : BM(NH)
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