. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 BULLETIN : MUSEUM OF COMPARATR'E ZOOLOGY palatal recesses (Fig. 3A, ). These are shallow pits Ijnng between the anterior margin of the endocraniuni and the over- lying dermal bones; they are separated from each other by posterior medial expansions of the premaxillary bones where each bone bears a stout tusk. When the lower jaws were oc- cluded (as seen in specimen MCZ 9830), these anterior recesses served to receive the tips of a pair of large tusks at the anterior ends of the lower jaw rami (ef. Thomson, 19
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 BULLETIN : MUSEUM OF COMPARATR'E ZOOLOGY palatal recesses (Fig. 3A, ). These are shallow pits Ijnng between the anterior margin of the endocraniuni and the over- lying dermal bones; they are separated from each other by posterior medial expansions of the premaxillary bones where each bone bears a stout tusk. When the lower jaws were oc- cluded (as seen in specimen MCZ 9830), these anterior recesses served to receive the tips of a pair of large tusks at the anterior ends of the lower jaw rami (ef. Thomson, 1962).. Fig. 3. Ethmoid region of tlie palate. Ventral view. A, Eciosteorliachis, B, Megalichihys. The lower jaws (Fig. 4, A, B, C; based mainly on specimens MCZ 8641, 8826, 8827). As may be seen in Figure 4A, the outer aspect of the lower jaw does not differ greatly from that of MegalichtJiys (as figured by Watson, 1926). It is made up of the dentary and four infradentary elements — splenial, post- spleiiial, angular, and surangular. These elements are ap- proximately demarked by grooves in the shiny continuous enamel covering on tlie dermal bones (Fig. 4A, gr.).. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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