. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 184 Annals of the Carnegie Museum. very heavy, and in the condylar process. The symphyseal suture is large. The anterior part of the jaw is farther strengthened by a ridge which passes from the upper part of the symphyseal suture obliquely around the outside of the jaw backward and downward to the chin. The anterior border of the coronoid process slopes upward and back- ward uniformly, in a nearly straight line, to near the tip, where it is broken off. The lower teeth are much smaller than th
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 184 Annals of the Carnegie Museum. very heavy, and in the condylar process. The symphyseal suture is large. The anterior part of the jaw is farther strengthened by a ridge which passes from the upper part of the symphyseal suture obliquely around the outside of the jaw backward and downward to the chin. The anterior border of the coronoid process slopes upward and back- ward uniformly, in a nearly straight line, to near the tip, where it is broken off. The lower teeth are much smaller than those of Arcfomys. The other parts of the skeleton so far as preserved are much like those of Arctomys. Measuremknts. Mm. Lengtli of skull loo Length from anterior of incisors to posterior of zygomatic arch 78 Width of skull at post-orbital constriction 21 Depth of snout just anterior to anterior root of zygomatic arches 27 Depth just back of incisor 25 Width just back of incisor 32 Antero-posterior diameter of upper incisors 9 Transverse diameter of upper incisors , Length of mandible including incisor 70 Length of lower molar-premolar series Depth of mandible of middle of symphysis Pal^arctomys macrorhinus sp. nov. No- 733- Figs. 24 and 25. The type of this species is a skull, lacking the nasals and the pos- terior portion of the cranium. The skull is very robust and about the. Fig. 24. Pahnai-ctomys macro)hiniis {¥.0. Til). Lower Madison Valley. Skull from right side. Natural size. size of that of Arctomys /iionax, but the region in front of the orbits is very much deeper and wider. The incisors are also much 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 Carnegie Museum; Carnegie Museum of Natural History. [Pittsburgh] : Published by authority of the Board of Trustees of the Carneg
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