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Show 1867.] DR. J. E, GRAY ON THE TAPIR.IDJE. 885 The upper hinder edge of the intermaxilla triangular, narrow, produced, with a part of the maxilla on the inner side separating it from the margin of the internasal aperture. The front edge of the cavities of the internal nostrils in a line with the hinder edge of the sixth tooth when all the seven grinders are developed, and in a line with the back edge of the fifth grinder when the sixth grinder is being developed, and also when it is completed and the seventh grinder is being developed. This last or seventh grinder is developed very late in life ; indeed I have not seen any skulls, either in the British Museum or in the College of Surgeons, where it is developed. There are three in each of these collections. De Blainville (Osteographie, Tapirus, pl. 2) figures the skull of an adult animal with all the seven grinders developed; and he represents the front edge of the hinder nasal opening as in a line with the hinder edge of the sixth or penultimate grinder, as in the skull of Tapirus americanus. The skull of the skeleton figured in plate 1 of the same work, like the skull in the British Museum, has only six grinders in the upper (and five in the lower). 2. RHINOCHCERUS ME. Me des chinois, Remusat, Ann. Sci. Nat. xviii. p. 5, t. 1. Hab. China. Tribe II. ELASMOGNATHINiE. The nasal aperture short, broad, subcordate, and truncated in front by the bony ridges of the maxilla. The upper jaw with a high sharp-edged crest on the upper inner edge, embracing the sides of the very large internasal cartilages, which early become entirely ossified into a bony plate, permanently dividing the nasal cavity, and forming a high bony crest on the front of the skull. ELASMOGNATHUS. The internasal cartilages ossified nearly the whole length, the bony part produced beyond the end of the nasal. Elasmognathus, Gill. ELASMOGNATHUS BAIRDII. (Pl. XLII.) Fur very short, close, dark black brown ; lower part of the cheeks and sides of the neck bay brown ; chin, throat, chest, and front edge of the shoulders greyish white. Young, born with pale stripes, Verrill, Silliman's Amer. Journ. Sci. July 1867; Ann. & Mag. N. H. 1867, xx. p. 232. Elasmognathus bairdii, Gill (?), fide Verrill. Hab. Panama; skull, Mus. Coll. Surgeons; Brit. Mus., adult and young skull. The internasal septum is continued between the elevated sharp upper edges of the maxillae, and even between the upper edges of the |