. Bulletin of the British Museum (Natural History), Geology. me. Fig. 3. Oreopithecus bambolii (Brit. Mus. M 11555, reversed). Left canine and P4, seen in lingual and slightly occlusal view. A, C, P, anterior, central and posterior foveae ; al, anterolingual crest of paracone ; me, metacone ; ob, oblique crest; pa, paracone ; pel, protoconule ; pr, protocone. 4. Thickness of enamel. Broken teeth show that many minor details of the pattern are represented in the dentine, the enamel forming a comparatively even layer over the crown. Using a micrometer eyepiece, measurements were made of the thic
. Bulletin of the British Museum (Natural History), Geology. me. Fig. 3. Oreopithecus bambolii (Brit. Mus. M 11555, reversed). Left canine and P4, seen in lingual and slightly occlusal view. A, C, P, anterior, central and posterior foveae ; al, anterolingual crest of paracone ; me, metacone ; ob, oblique crest; pa, paracone ; pel, protoconule ; pr, protocone. 4. Thickness of enamel. Broken teeth show that many minor details of the pattern are represented in the dentine, the enamel forming a comparatively even layer over the crown. Using a micrometer eyepiece, measurements were made of the thickness of enamel, perpendicular to the dentine surface. On M3 it ranged from 0-4 to o-8 mm., on M2 from 0-5 to o-8 mm., and on M1 from 0-5 to 0-7 mm. On the milk-molars the enamel is thinner, the greatest thickness found being 0-4 mm. On the premolars and canine it is about as thick as on the molars. 5. Wear facets. Examination of the wear facets on the milk-molars and molars by reflected light under suitable magnification shows that each facet is covered by numerous fine parallel marks. These are readily distinguished from the smaller number of scratches, usually coarser and going in various directions, due to subse- quent damage to the surface ; the regular scratches must have been produced by chewing movements (Butler, 1952 ; Mills, 1955). The positions of the facets are shown in Text-fig. 4A, where they are shaded in accordance with the direction of the scratches. It will be seen that on some facets the scratches are transverse to. 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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