PLATE LXXVI. 



DlNOSAURIAN SKULLS; SHOWING SIZE OI' BRAIN. 



Page. 

 Fig. 1. Skull and brain cast of Sterrholophus Jlabellatus Marsh; seen from 



above; one-twentieth natural size 211 



c, Bupratemporal fossa; d, epijugal bone; e, epoccipital bone;/, brain 

 cast; h, horn core; h', nasal horn core; n, nasal bone; p, parietal; r, 

 rostral bone; », squamosal. 



Fig. 2. The same of Claosaurus anvectens Marsh ; one-tenth natural size 222 



a, nasal opening; 6, orbit; c, infratemporal fossa; d, dentary; e, exoccip- 

 ital; /, frontal; fp, postfrontal; ,/, jugal; I, lachrymal; m, maxillary; 

 n, nasal; pf, prefrontal; pm, premaxillary; q, quadrate; qj, quadra- 

 tojugal; s, squamosal. 



Fig. 3. The same of Camptosauritii medias Marsh; one-fourth natural size 227 



a, nasal opening; bo, basioceipital ; /, frontal ; fp, postfrontal; if, infra- 

 temporal fossa; j, jugal; J, lachrymal; n, nasal ; o, orbit; pf, prefrontal ; 

 pm, premaxillary; </, quadrate; qj, quadratojugal; s, squamosal; sf, 

 supratemporal fossa; so, supraorbital bone. 



Fig. 4. The same of Diplodocus loiujus Marsh; one-sixth natural size 178 



a, aperture in maxillary; u, antorbital opening; c, nasal opening; c', 

 cerebral hemispheres; d, orbit; e, lower temporal fossa; /, frontal bone; 

 /', fontauelle; m, maxillary bone; m" , medulla; n, nasal bone; oc, 

 occipital condyle; ol, olfactory lobes; op, optic lobe; p, parietal bone; 

 pf, prefrontal bone; pm, premaxillary bone; q, quadrate; qj, quadra- 

 tojugal bone. 

 396 



