. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fossil Aardvarks • Patterson 187 are set off from each other by small gaps comparable to those occurring in Oryc- teropus and Myorycteropus. All teeth show tubular1 structure. The tubes increase in size from the canines backward and also, particularly in the molars, from the centers to the peripheries of the teeth. Canines and premolars have a continuous peripheral ring of cement2; in this feature they closely resemble the sections of the last lower milk molar of O. afer figured by Thomas (1890). The ring is thin in P
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fossil Aardvarks • Patterson 187 are set off from each other by small gaps comparable to those occurring in Oryc- teropus and Myorycteropus. All teeth show tubular1 structure. The tubes increase in size from the canines backward and also, particularly in the molars, from the centers to the peripheries of the teeth. Canines and premolars have a continuous peripheral ring of cement2; in this feature they closely resemble the sections of the last lower milk molar of O. afer figured by Thomas (1890). The ring is thin in PT and evidently not present in M—~—. The upper canine is oval in contour, wider and slightly longer than any of the premolars preserved, either upper or lower. Of the lower canine only the posterior extremity is present. V\ are the smallest of the cheek teeth and are rather wider relative to length than the narrow, elongate- oval Pv2^- P7 is wider posteriorly than its predecessors. What remains of the alveoli of My suggests that the size difference between premolars and molars was at least as pronounced as in Orycteropus and per- haps more so. M-~— are similar to the corresponding teeth of the living species, both in size and structure. The two lobes of M- are approximately equal, the labial groove is deeper than the lingual, the anterior face is flat and the posterior rounded. M- is broadly oval in outline with only a vestige of the labial groove present. Skull. The anterior part of the right maxilla includes the palatal portion as far as the median suture. This fragment shows that the bony palate was flat transversely and very slightly concave anteroposteriorly, did not have a median groove, and was not 1 Machines (1956, ), pointing out that tu- bule, in dental terminology, is universally used for the minute canals that enter the dentine from the pulp cavity, prefers column or pillar as a name for the macroscopieally visible structures. However, these are literally
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
