36 



DINOCERATA. 



VIII, figure 1, cd). The position of the condyles was e^adently 

 necessitated by the long upper tusks, since with the ordinary unguhite 

 articulation the mouth could not have been fully opened. The low 

 position of the condyle, but little above the line of the teeth, is also a 

 noteworthy character. In some Marsupials and Insectivors, the condyle 

 has the same position as in the Dinocerata, but in no other Ung-ulates, 

 living or extinct, has this position been observed. 



FiGTiKE 36. — Lower jaw of Tiitoceras annecteiis, Marsh (No. 10431; seeu from lUi; left. 

 Figure 37. — The same jaw, seen from above. 



c. alveole of lower canine; d. diastema; i. alveole of iucisor; m. mental foramen; j). process for 



protection ol' canine tusk ; s. symphysis. 



Both figures are one-fonrtli natural size. 



In Dinocems lafk.cps (Plates XII and XIII), the entire lower jaw is 

 more massive than in Bii/oceids mlrabilc. The angle of the jaw is stouter, 

 and distinctly inflected (Plate XIII, figure 2, a.) 



