. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Skull of American Tritylodontidae • Sues 221. 3 CM Figure 1. Skull of Kayentathehum wellesi, MCZ 8812. Right lateral view. Coronoid process indicated in broken line. Abbreviations for this and the following figures are listed at the end of the text under Appendix. Lewis and T. M. Bown (Denver), K. A. Joysey (Cambridge), P. Wellnhofer (Mu- nich) and F. Westphal (Tiibingen). I owe a special debt of gratitude to A. J. and M. Charig for extending the generous hospi- tahty of their home to me during an ex- tended stay. I a
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Skull of American Tritylodontidae • Sues 221. 3 CM Figure 1. Skull of Kayentathehum wellesi, MCZ 8812. Right lateral view. Coronoid process indicated in broken line. Abbreviations for this and the following figures are listed at the end of the text under Appendix. Lewis and T. M. Bown (Denver), K. A. Joysey (Cambridge), P. Wellnhofer (Mu- nich) and F. Westphal (Tiibingen). I owe a special debt of gratitude to A. J. and M. Charig for extending the generous hospi- tahty of their home to me during an ex- tended stay. I am much indebted to W. W. Amaral who has been instrumental during the often extremely difficult prep- aration of the specimens and who patient- ly taught me the skills of his craft. I also acknowledge the able assistance by A. H. Coleman (photography) and L. L. Mesz- oly (labelling). Research reported here was supported by the Anderson Foundation of Harvard University, The Geological Society of America, an NIH Training Grant in Mus- culoskeletal Research (5 T32 GM071 IT- OS) and various fellowships from the De- partment of Biology and the Graduate School of Arts and Sciences of Harvard University. An earlier version of this pa- per formed part of a dissertation submit- ted in partial fulfillment of the require- ments for the degree of Doctor of Philosophy to Harvard University in 1983. Since then I have been able to revise and expand parts of this work under tenure of a postdoctoral fellowship in the laboratory of R. L. Carroll at McGill University (Montreal), to whom I am grateful for his continued interest and support. SKULL The skull of Kayentatherium (Figs. 1, 2, 4 and 24) has a short and broad snout and a long and narrow postorbital region. The postorbital region of Dinnebitodon is apparently relatively shorter (MNA V3223) and its skull proportions are more closely comparable to those of Bieno- therium as restored by Young (1947). The external nares are separated by an in
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