SKULL OF DlNOTHElllUM GIGANTEUM. 



529 



lost, bvit in any case do not seem to have formed any median pro- 

 jection over the nasal opening. The maxilla (onx.), which formed 

 the sides of the nasal opening at least in part, is a very massive 

 and greatly developed bone. Externally to its tooth-bearing 

 and palatal region it is produced laterally into a shelf of bone 

 the hinder border of which is opposite the hinder lobe of the 

 first molar. Posteriorly it forms the floor of the orbit, and no 



Text-fio-ure 2. 



StuU of Dinotlierium gigantewm. 

 From above: about tV iiat. size. 



U.S., outer angle of squamosal; ex.n., external nares ; /i(^., jugal; ?.c., lambdoidal 

 crest; n.f., nuchal fossa: o.c, occipital condyles; oc.s., occipital surface; 

 p.orh., postorbital process of {xo\\tA\; pt.fl., post-tympanic flange ; j\, ridge 

 from outer angle of squamosal. 



doubt joined the jugal, on which the lower post-orbitol process 

 is borne. In front of the orbit the maxilla foi'ms a great mass of 

 bone, terminating laterally in a I'ugose somewhat concave surface 

 for the attachment of a muscle (m.s.), probably the maxillo- 



36* 



