. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Bulletin Museum of Comparative Zoology, Vol. 147, No. 1. Figure 37. Occlusal wear facets 1 and 5 (Phase I) in Elphi- dotarsius (posterior oblique view of right M,_3). develops on the buccal surface of the entoconid and may extend to include the hypoconulid region. This facet is most extensive and best developed on M3. Facet 7, variably developed on the buccal surface of the paraconid and metaconid, is a con- tinuation of facet 6 of the next anterior tooth (Kay and Hiiemae, 1974a) and in some cases these two facets app
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Bulletin Museum of Comparative Zoology, Vol. 147, No. 1. Figure 37. Occlusal wear facets 1 and 5 (Phase I) in Elphi- dotarsius (posterior oblique view of right M,_3). develops on the buccal surface of the entoconid and may extend to include the hypoconulid region. This facet is most extensive and best developed on M3. Facet 7, variably developed on the buccal surface of the paraconid and metaconid, is a con- tinuation of facet 6 of the next anterior tooth (Kay and Hiiemae, 1974a) and in some cases these two facets appear to be confluent with facet 2 (on the paracristid). Shearing surfaces may be increased in num- ber by fenestration of any Phase I facets; this is, of course, prevalent in individuals at advanced stages of wear. Shearing facets (Phase I) on P4 are, surprisingly, poorly developed or absent from most specimens. A few specimens of Elphidotarsius reveal small striated facets, probably homologous with facets 1 and 5, on the posterobuccal surface of the two posterior apical cusps (the presumed homo- logues of the protoconid and metaconid). Specimens of Carpodaptcs, as a rule, show no better-developed wear surfaces than in Elphidotarsius. In Carpolestes some in- dividuals have small striated facets on the buccal surface of apical cusps on the poste- rior two-thirds of the tooth. These small facets become confluent on a few heavily- worn individuals ( PU 19030; see Fig. 39D). A few specimens of P4 in Carpolestes display heavy abrasive wear (Fig. 39). No P4's examined show such extensive Phase I facets as indicated by Butler (1973: fig. 11). Phase II facets are much less clear than those of Phase I. Facet 9, on the lingual surface of the hypoconid, has been detected on one or more molars of each genus, but facet 10, on the lingual surface of the protoconid, has been observed only on M8 on a few ( Elphidotarsius, PU 14285). This is in accord with Butler's (1973) ob- servation t
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