507 



proportion of the palatine bones enters into the formation of the bony palate than in the Tapir ; 

 they chiefly form the sides of the extensive oblong hinder aperture of the nasal passages, the 

 anterior boundary of which is opposite the first true molars. The pterygoid processes are 

 perforated at their base, lengthwise, by the ectocarotid arteries. The nasofrontal suture is 

 in advance of the orbits, and is shaped like the letter V. The postglenoid process is pro- 

 duced into a long subtrihedral, obtuse process : the post-tympanic process takes the place of 

 the true mastoid, and is here a strong quadrate process applied to the base of the paroccipital. 

 The interspace between the post-tympanic process and the exoccipital gives exit to a cranial 

 vein, but does not expose any part of the true mastoid. The orbits are very obscurely marked 

 off from the temporal fossae : there is no postorbital process, and there is no superorbital 

 foramen. The lacrvmal canal commences by two apertures defended by a rough protuberance 

 of the lacrvmal bone. There is a well-developed pit for the origin of the inferior oblique. 

 The premaxillaries are small and do not join the nasals. 



Presented by Sir Stamford Raffles, P.Z.S. 



2935. The skull of a male Sumatran Rhinoceros (Rhinoceros sumatrensis). 



The crown of the last true molar is beginning to appear above the formative socket. The 

 fangs of the first premolar may be seen in the upper jaw. The left premaxillary retains the 

 small incisor behind the larger one. The frontal bones show the rough surface for the hinder 

 horn. The lacrymal protuberance has an accessory ossicle. The three processes, viz. par- 

 occipital, post-tympanic, and postglenoid, are well displayed in this skull. 



Presented by Sir Stamford Raffles, P.Z.S. 



2936. The skull of a young Sumatran Rhinoceros (Rhinoceros sumatrensis). 



The premaxillary bones and the portions of the nasal bones that have supported the ante- 

 rior horn are wanting. The molars in place are the four deciduous and the first and second 

 true molars on each side : the second deciduous molars have been artificially removed, to ex- 

 pose the germ of the corresponding premolar in its formative alveolus. The permanent in- 

 cisors are beginning to appear in the lower jaw. 



Presented by Sir Joseph Banks, P.R.S. 



2937. The left moiety of a vertically and longitudinally bisected cranium of a Suma- 

 tran Rhinoceros (Rhinoceros sumatrensis'). 



It shows the extension of the air-cells as far back as the base of the superoccipital ridge. 

 The postgleuoid process equals in length the paroccipital, and is much thicker. The post- 

 tympanic, situated between these, is shorter and bent forwards : there is the outlet of a venous 

 foramen between its base and the exoccipital. There is a minute second incisor behind the 

 socket of the larger and normally retained anterior one : the rhineucephalic compartment is 

 large and well defined. The bones of the cranium are numbered on coloured labels corre- 

 sponding with the TABLE OF SYNONYMS. 



Presented by Sir Stamford Raffles, P.Z.S. 



3T2 



