100 
TEliTIAKY VEllTEBEATA OF THE FATtJM. 
prominent zygomatic arches. The cranial region is nearly twice as long as the facial 
region. Tlic 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 
jn'obably due to tlie deepening of the promaxilla3 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 Maritherium lijonst : A, from above ; 13, from left side. 
ant.orh., antorbital foramen ; ex.oc., exoccipital ; frontal ; ja., jugal ; mx., maxilla : n., nasal ; 
p<i., parietal; p.mx., premaxilla; post-tympanic process of squamosal; s.oc., su])raoccipltal ; 
sq., squamosal, i. 1, i. 2, i. 3, incisors; c., canine; q»ii. 2, qmi. 3, 4, premolars ; m. \, m. 2, in. 3, 
molars. About 4 nat. size. 
posteriorly; the ])ostorbital process of the jugal is fairly well marked, but that of tlie 
frontal is practically obsolete. The large anterior nasal opening is situated near the 
end of the snout, but is widely separated from the alveolar border, the premaxillm 
being greatly deepened to carry the large incisors (PI, IX. fig. 1 and PL X. fig. 3). 
The internal narial opening in this specimen is opposite the front of the still uncut 
