1903.] Lull, Skull of Triceratops Serratiis. 695 



Exoccipitals, greatest fore and aft width 260 mm. 



" least " " " " 147-5 



Parietal bones, ventral aspect, length 808 



" " least width 742-5 



" " " " greatest" ii5-4 



Squamosal bones, ventral aspect, length 820 



width 355 



Postfrontal fontanelle, height 97 



" width 130 



Infratemporal vacuity, length 130 



" height 52 



Right horn core, longitudinal diameter at base 235 



" transverse " " " 215 



" orbit, length 170 



height 115 



Lower jaw, length of dentary 672.5 



" " greatest depth to summit of teeth 183 



" height of coronoid 287.5 



" " length of dental channel 324 



