. Bulletin - United States National Museum. Science. 72 UNITED STATES NATIONAL MUSEUM BULLETIN 247 pressed from side to side, truncated at both ends, and rather flat dorsally. The posterior or occipital face of the braincase is almost vertical and the elongated premaxUlaries are bent strongly downward. The occipital condyles are not visible when viewed from above. The ovoidal mesorostral fossa is also noticeably elongated, widened near the middle of its length and extends backward beyond the orbit. The somewhat horizontal dorsal surface of the braincase is slightly depressed longitudinally bet
. Bulletin - United States National Museum. Science. 72 UNITED STATES NATIONAL MUSEUM BULLETIN 247 pressed from side to side, truncated at both ends, and rather flat dorsally. The posterior or occipital face of the braincase is almost vertical and the elongated premaxUlaries are bent strongly downward. The occipital condyles are not visible when viewed from above. The ovoidal mesorostral fossa is also noticeably elongated, widened near the middle of its length and extends backward beyond the orbit. The somewhat horizontal dorsal surface of the braincase is slightly depressed longitudinally between the low flat-. FiGURE 32.—Dorsal view of skull, USNM 16757, oi Metaxytherium calverteme, with left jugal restored and rostrum corrected for distortion. Abbrs.: Fr., frontal; Ju., jugal; La., lachrymal; , mesorostral fossa; Na., nasal; Pa., parietal; Pmx., pre- maxillary; , supraorbital process of frontal; Sq., squamosal zyg., zygomatic process of squamosal. tened temporal crests. These crests strongly converge some 55 mm. anterior to the supraoccipital crest, where they are separated by a minimum 15 mm. interval; they then grad- ually diverge anteriorly until an interval of 50 mm. sepa- rates them, and these crests become indistinct. The elongated parietals are so intimately ankylosed to the supraoccipital that no sutural contact is discernible. At this contact posteriorly a low transverse crest is devel- oped below which the occipital face abruptly descends to the foramen magnum. Anteriorly the parietals make a forklike sutural contact with the frontals. The narrowest part of the braincase roof is about 95 mm. anterior to the low transverse crest that marks the ankylosis of the supra- occipital and the parietals; at this point the width is 65 mm. The roof widens slightly toward its anterior end where its transverse width is about 75 mm. Inside the temporal crests on the top of the braincase the maximum length of the right parietal is 100 mm. and the maximum
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