SYNOPSIS. 



217 



Tlnocei'jis steiiops, Marsh. 



Woodcuts: 5:5, 54, p. 47; and 194, Tjelow. 

 Fig. 194. 



FiGHRE 194. — Skull and lower jaw of Tinoceras strnopf:, Marsli (No. 1.5(;7l. 



c. condyle of lower jaw; d. diaslema; m'. maxillary protuberance; n'. nasal protuberance; 0. occipital 

 condyle; p'. parietal protuberance; p»i. premaxillary lioiie. 

 One-eighth natural size. 



Marsh, Fifth Annual Report of the U. S. Geological Survey (figures from the present 

 volume, viz:) figs. 90, 91, p. 283, 1884. 



The skull in the type specimen of this species (number 1567) is 

 narrow, and elongated. The nasal protuberances are flat below, and 

 above. They appear to have been divergent, but of moderate size, 

 th(iug]i situated Avell forward. The ma.xillarv jirotuberances were 

 prominent, directed well forward, and connected by a transverse ridge. 

 Behind them, on each side, stands a pnimiiient protuberance over the 

 orbit. Back of this, the superior and lateral surfaces of tlie skull jiass 

 into each other by regular curvature in front of the origin of the lateral 

 ridges, which 'rise abruptly upon the parietal protuberances. These 

 elevations are imperfectly preserved, but are flattened in front, and 

 situated behind the post-glenoid processes. 



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