. Bulletin - American Museum of Natural History. Natural history; Science. 88 Bulletin American Museum of Natural History. [Vol. VII, Professor Cope and by others who examined them as to whether the tuberosities (H) above the orbits could really be regarded as in- cipient horns. These doubts have now been removed by the discovery of T. comulum, and Dr. Wortman's observation is Fig. 7. Tel»iatotlieriu)ii vallidens. Composition, Nos. 1569-70. Side view of skull. One- fourth natural size. T. vallidens presents the first transitional features towards T. cornutum and the later Titanother
. Bulletin - American Museum of Natural History. Natural history; Science. 88 Bulletin American Museum of Natural History. [Vol. VII, Professor Cope and by others who examined them as to whether the tuberosities (H) above the orbits could really be regarded as in- cipient horns. These doubts have now been removed by the discovery of T. comulum, and Dr. Wortman's observation is Fig. 7. Tel»iatotlieriu)ii vallidens. Composition, Nos. 1569-70. Side view of skull. One- fourth natural size. T. vallidens presents the first transitional features towards T. cornutum and the later Titanotheres. The horns exhibit the most rudimentary stage imaginable ; they are borne more upon the frontals and less upon the nasals than in T. cornutum. The cranium is broad upon the upper surface between the orbits and narrows very gradually towards the occipital region, where the two temporal crests converge. They do not, however, unite into a single sagittal crest, but leave a deep median pit followed by a narrow valley which opens out into a triangular space between the occipital crests. The occiput is very broad and low. In addition to those above mentioned, there are other features which separate T. vallidens from T. cornutum, especially (i) the absence of an infraorbital shelf upon the malar, (2) the short wide- spreading and relatively heavy form of zygomatic arches, (3) the relative shortness of the nasals, (4) the more slender postglenoid processes, (5) the shortness of the premaxillary symphysis. In general the face and the nasals are relatively shorter in T. valli- dens than in T. cornutum ; there is little or no diastema behind the canines ; the posterior nares open much further forwards, or. 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 American Museum of Natural History; Allen, J. A. (Joel Asaph),
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