PL^TE XIII. 



DINOCERATA. 

 Lower jaw of ITixocekas laticeps, Marsh. 



Oue-tliird Natural Size. 



Fig. 1.— Lower jaw; (No. 10.39,) seen from the left, 



Fn;. 2. — Lower jaw; posterior view, 



c — Socket for canine tootii. 



m — Mental foramen. 



P —Process for protection of canine tusk. 



« — Angle of jaw. 



c<?— Condyle. 



cr — Coronoid process. 



<? — Dental foramen. 



s — Symphysis. 



