RevieiDS — Prof. 0. C. Marsh's Dinocerata. 



217 



just in front of the summit of the cerebral hemispheres (see Fig. 5). 

 It also divides the posterior elevations, or horn-cores, so as to leave 

 the anterior part of them on the frontals, and the posterior and 

 highest portion on the parietals. 



" In all the crania of the Dinocerata examined, the parietal 

 bones are firmly united to each other on the medial line, and with 



the supra-occipital behind On the sides of the cranium, 



the parietals form the upper portion of the large temporal fossee. 



" The occipital i-egion in all the known Dinocerata is large, 





Tw^^ I i' vj 'Xu' 



1^ iiiMiiiMum 

 / 



Fig. 6. — Palatal view of skull of Tinoceras 

 ingens, Marsh ; one-eighth natural size, a, 

 anterior palatine foramen; b, palato -maxil- 

 lary foramen ; c, antorbital foramen ; d, 

 posterior palatine foramen ; e, posterior 

 nnres ; /, foramen magnum ; /', occipital 



foramen ; g, stylomastoid foramen ; /*, foramen lacerum posterius ; i, vascular fora- 

 men in basisphenoid ; j, posterior opening of alisphenoid canal ; k, anterior opening 

 of alisphenoid canal ; I, optic foramen. 



Fig. 7. — Palatal view of skull of 

 Dinoceras mir'abile, Marsh; one- 

 eighth natural size. 'J'he explana- 

 tion of the letters is the same as 

 that for Fiff. 6. 



