100 
TEllTTAIiY VEllTEr5EATA OF THE FATDM. 
])romiiient zyg'omatic arches. The cranial region is nearly twice as long as the facial 
region. The dorsal surface is straight or very slightly concave from before backwards, 
the highest portions of the skull-roof being the point of junction of the lambdoidal 
and sagittal ridges posteriorly and the nasals anteriorly. The anterior prominence is 
probably duo to the deepening of the premaxillm and maxillm, resulting from the great 
enlargement of the second pair of incisors. The orbit is very small and is open 
Text-fig. 40. 
Restored skull and mandible of Mceritlicrium Itjonsi : A, from above ; 13, from left side. 
ant.orh., antorbital foramen; ex.oc., exoccipital ; //•., frontal; ju., jngal ; mx., maxilla; nasal; 
l>a., parietal; p.mx., premaxilla; post-tym[)ainc process of squamosal; s.oc., supraoccipital ; 
Sly., squamosal, i. 1, i. 2, {. 3, incisors; c., canine; yu/n 2, pm. 3, pm. 4, jiremolars ; m. 1, m. 2, m. 3, 
molars. About 1 nat. size. 
])osteriorly ; the postorbital process of the jugal is fairly well marked, but that of the 
frontal is practically obsolete. The large anterior nasal o])ening is situated near the 
end of the snout, but is widely separated from the alveolar border, the ])remaxilke 
being greatly deepened to carry the large incisors (Tl. IX. fig. 1 and I’l. X. fig. 3). 
d'he internal narial opening in this specimen is opposite the front of tlie still uncut 
