530 



DR. C. W. ANDREWS ON THE 



labialis supeiior. The Icacluynial bone perhaps took part in 

 the formation of this pre-orbital mass, but its limits cannot 

 be determined. The very large antorbital foramen {a.f.) opens 

 on the lower surface of the maxilla, about mid-way between its 

 prominent pre- orbital boss and the premolar teeth. The point of 

 union of the maxillfe with the premaxillfe is probably marked by 



Text-fio'ure 3. 



mx. 



Skull of Dinotherium gigantetim. 

 From below : about tV nat. size. 



a.f., antoibital foramen; al.c, posterior opening of alisplienoid canal; a.s., outer 

 angle of squamosal; a«., external auditory meatus; f.l-TP-, P foramen 

 laccrum postering ; j., jugal ; gl., glenoid surface for mandible ; m. 3, third 

 molar; m.r., maxilla: no.c, occipital condyles; ^mx., premaxilla ; pt.fl., post- 

 tympanic flange; t.b., ? tympanic bulla; syg., zygomatic process of the 

 S(iuamosal. 



the sudden narrowing of the snout about 40 centimeties in front 

 of the orbit. The suture between the two bones can be traced 

 for a short distance on the palatal siuface. 



