. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. MUSEUM OF COMPARATIVE ZOOLOGY. 165 METAMYNODON, gen. nov. Dentition : I. |, C. \, Pm. f, M. |. Upper and lower canines obliquely placed, the latter fitting somewhat internal to the former when the jaw is closed. The first upper premolar wanting; the second, third, and fourth pre- molars are of the molar pattern. Post-glenoid and post-tympanic processes widely FiGUHE 7. — Skull of Mttaviynodonplanifrvns, iu side view,'about one sixth natural size. Metamynodon planifrons, sp. nov. Specific characters.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. MUSEUM OF COMPARATIVE ZOOLOGY. 165 METAMYNODON, gen. nov. Dentition : I. |, C. \, Pm. f, M. |. Upper and lower canines obliquely placed, the latter fitting somewhat internal to the former when the jaw is closed. The first upper premolar wanting; the second, third, and fourth pre- molars are of the molar pattern. Post-glenoid and post-tympanic processes widely FiGUHE 7. — Skull of Mttaviynodonplanifrvns, iu side view,'about one sixth natural size. Metamynodon planifrons, sp. nov. Specific characters. First upper molar Avith an incomplete internal cingulum. Lower median incisors small. The molars greatly exceeding the premolars in size. genus is represented by a single skull in fine preservation, and the anterior portion of the left mandibular ramus. The latter specimen Avas found some little distance from the skull, but for many reasons may be safely placed with it. The canine-incisor formula is the same, and the diameters of the canine fangs are similar. There is one less premolar, but the molar-premolar series as a whole has the same antero-posterior length. Metaviynodon is evidently a highly modified successor of Amynodon, of about dou1)le its size and strength. The dentition is reduced by the loss of one upper and two lower premolars. The pattern of the premolars presents a slight pro- gression in the complication of the transverse crests of pm^ ; but as a series they show a decided retardation of growth as compared with the molars which assume very large proportions. The mandibular symphysis is relatively much narrower. The sagittal crest is still more powerful. The skull is modi- fied by the unusual shortening of the facial region, and the flattening of the cranium and broadening of the zygomatic arches, but without the develoj)-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
