0. C. Marsh—The Order Theropoda. 339 
EXPLANATION OF PLATES. 
PLATE VIII. 
Figure 1.—Skull of Ceratosaurus nasicornis, Marsh; side view. 
Figure 2,—The same skull; front view. 
rate ee same get top v 
sal open b, horn-eore; «¢, ie Geis bital opening; * pei e, lower 
t pcm fonat: 7, foramen in lower jaw; ¢, transverse bon 
All the figures are one-sixth natural size. 
PLATE IX. 
Figure 1.—Skull and vonage of Ceratosaurus nasicornis, Marsh; seen = 
above, one-sixth natural s 
a, os SY Sih ng; b, horn-core; c, antorbital opening; c’, cerebral hemispheres ; 
d, orbit; ¢, lower ma eo fos none A oo bone; h, supra-temporal fossa ; 
J, jugal bone; m, maxillar m’, ulla; m, nasal bone; 0c, “nin 
condyle ; ol, olfactory 1obéa oe prefntal bone ; pm, pre e-maxillary bone ; 
%, quadra te bone ; qj, quadrato-jug: 
Figure 2. Seta of same skull; side view. One-fourth natural siz 
¢, cerebral hemis sphere ~~ cb, rob ellum ; m, medulla; of, otactory lobes ; 
On, Optic nerve ; op, optic a lener Pp, pituitary body. 
FIGURE 3.—Ki ight. pre-maxillary bone of Creosaurus atrox, Marsh; front view ; 
one-sixth natural 
2a, lateral view, dicedic outer side ; 2b, lateral view, showing inner surface. 
Figure 4.—Left @ dentary bone of Labrosaurus ferox, Marsh; superior view ; one- 
sixth natural size. 
FIGURE 65,—The same bone; lateral view, outer side. 
FiguRE 6.—The same bone; lateral view, inner side. 
PLATE X. 
Figure 1.—Ailas of Ceratosauris nasicornis, Marsh. 
Figure 2. —Axis of Ceratosaurus nasicornis. 
Figure 3. —Third vertebra of Ceratosaurus nasicornis ass 
4, side view; b, front view; ¢, posterior view; 4, top view ; ¢, inferior é 
Figure 4, —Sixth vertebra of Ceratosaurus nasicornis ; side view. 
FigURE 5.—Dorsal vertebra of Ceratosaurus nasicornis ; side view. | a . 
Fiourr 6.—Fifth caudal vertebra of same species, with chevron in natural — 
tion; side vie : 
All the Neaked are aie natural size. 
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