1867.] DR. J. K. GRAY ON THE TAPIRIDvE. 88.5 



The upper hinder edge of the intennaxilla 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 Bri- 

 tish Museum or in the College of Surgeons, where it is developed. 

 There are three in each of these collections. 



De Blainville (Osteographie, Tapirus, pi. 2) figures the skull of 

 an adult animal with all the seven grinders developed ; and he re- 

 presents 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 Tajni'us 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. RHINOCHtERUS ME. 



Me des chitiois, 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. (PI. 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, G\\\{J), 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 maxillee, and even between the upper edges of the 



