. Bulletin. Natural history; Natuurlijke historie. 76 REVISION OF THE UINTATHERES tions of the incisors, that do not occur in all insectivores and are occasionally paralleled in other orders but that nevertheless appear so frequently among in- sectivores that they seem to reflect a certain genetic tendency and to help bind the group ; I would suggest that the great similarity of the astragalus may well be, as Matthew suggested, more than just convergence. Perhaps here, too, certain "peculiar specializations reflect a certain genetic tendency and help to bind the group togeth
. Bulletin. Natural history; Natuurlijke historie. 76 REVISION OF THE UINTATHERES tions of the incisors, that do not occur in all insectivores and are occasionally paralleled in other orders but that nevertheless appear so frequently among in- sectivores that they seem to reflect a certain genetic tendency and to help bind the group ; I would suggest that the great similarity of the astragalus may well be, as Matthew suggested, more than just convergence. Perhaps here, too, certain "peculiar specializations reflect a certain genetic tendency and help to bind the group ; Consideration of yet a third animal type may serve to strengthen this possi- bility. Carodnia, from the Paleocene of Brazil, was first described by Simpson (1935) from a third molar which was very uintathere-like, Paula Couto (1952) has since described Carodnia from excellent material, and assigned it to a new order, Xenungulata. (Fig. 9.). Fig. 9. Diagram of left molar teeth of Carodnia. M—r resemble the same teeth of Hypercorypho- don, an Oligocene pantodont from Mongolia. The third mo- lars bear a close resemblance to the third molars of uintatheres. The lower third molar of Ca- rodnia does lack a crest on the hypoconid and the metastylid adjacent to the metaconid. A, upper molars; B, lower molars. (After Paula Couto 1952). The premolars of Carodnia are large, blunt, and rather entelodont-like. The first two molars above and below have two transverse lophs, somewhat like the Asian pantodont, Hypercoryphodon. But the third upper and lower molars are much like the uintathere counterparts and are the only teeth outside of the Dino- cerata which have this pattern. The third upper molar has a long crest curving around like the anterior loph of a uintathere molar. The posterior loph does not meet it quite so closely as in the uintathere tooth, and the hypocone is large and affects the outline of the tooth which bulges out to accommodate it. The third lower molar of Car
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