1898.] Osborn, Skeleton of Teleoceras fossiger. 55 



tion, and except in the case of the artificial elongation of a few 

 of the ribs and completion of the upper border of the scapulae 

 (from complete scapulte of smaller size) no plaster was necessary. 



Skull. — Nasals smooth, expanding into a laterally-compressed 

 beak anteriorly, probably characteristic of adult females, with 

 sharp sides and a lateral notch. Temporal ridges forming a 

 sessile sagittal crest ; premaxillaries with triple infraorbital fora- 

 mina ; lachrymals with well-defined, knoblike projection ; zygo- 

 mata very deep, with extensive attachment for masseter muscle 

 inserted on a well-defined ridge on angle of jaw. Occiput broad 

 and low. Jaw with a single mental foramen below the second or 

 third premolar, and a marked median depression between the 

 canines upon front surface of the chin. 



Dentition. — Formula : If, Cf , Pf , M|. Lower and median 

 upper incisors vestigial ; lower canines worn, enamel measuring 

 40 mm. (i^^ inches). Adult condition indicated by very slight 

 wear of crown of third superior molar. Upon outer surfaces of 

 upper grinders parastyle nearly obsolete. First upper molar with 

 enamel crown of same length as that of premolars. Second 

 upper molar with sudden elongation or hypsodontism, with enamel 

 crown measuring 70 mm. Thus m| and mf elongate or hyp- 

 sodont, and of great service as reserve teeth for old age. Molars 

 with secondary folds characteristic of the species. 



Vertehrce. — Atlas much narrower than in i?. indie ns, with verte- 

 braterial canal directly traversing the transverse process ; axis 

 with a very low spine ; cervicals 1-3, with transverse process 

 restored ; characters of inferior lamellae somewhat conjectural. 



Supposed Vertebral Formula : C.7, D.19, L.3, S.5. 



The above formula is purely conjectural. It is made to con- 

 form to that of the living R. unicornis and R. sumatrensis.^ Sev- 

 enteen of the ribs are provided with both capitular and tubercular 

 facets. The ribs are extremely long and powerful, not very widely 

 arched ; lower line of chest nearly reaching the ground, as in 



' The definitely ascertained formula of the Oligocene A. tridactylum is D, ig ; L, 5 ; S, 3. 

 This animal gives us no clue to A . fossiger, because it belongs to the Dicerathere series. 



