557 



3342. The skull of a female Babyroussa. Hunterian. 



3343. The skull of a female Babyroussa. Hunterian. 



3344. The skull of a Babyroussa, somewhat mutilated, and the dentition incomplete. 



The upper tusks show the same inferiority of size as the two preceding specimens. 



Presented by Thomas Keate, Esq. 



3345. The skull of a female Babyroussa. 



The cranium has been transversely bisected through the largely developed mastoids, 

 showing their cellular structure. The mastoid is confluent with the tympanic and squamosal, 

 but not with the petrosal : that capsule of the acoustic organ retains its primitive individual 

 character, and may be detached from the other elements of the ' temporal bone.' The large 

 occipital air-sinus is seen above the cranial cavity ; there are no sphenoidal sinuses ; the 

 pterygoid fossae are small and simple in this skull. 



Hunterian. 



3346. A longitudinally bisected cranium of a Babyroussa. 



It shows the extension of the air-cells through the upper part of the cranial cavity to the 

 occiput, and the communication of the sphenoidal sinus with the pterygoid fossae. The con- 

 stituent bones have been numbered on coloured labels, according to the TABLE or SYNO- 

 NYMS. 



Presented by William Long, Esq. 



3347. The skull of a Babyroussa, wanting part of the occiput. The dried integu- 

 ment is left upon the fore part of the skull. Hunterian. 



3348. The skull of a Babyroussa, with the grinding surface of all the molars much 

 worn, and the base of the skull removed, showing the canal of communication 

 between the sphenoidal and right pterygoid sinus. 



Presented by Sir Everard Home, Hart., V.P.R.S. 



3349. The cranium of a Babyroussa, wanting the canines and incisors. The inner 

 division of the pterygoid cells is shallow. The upper division ascends to the 

 posterior root of the zygoma. Hunterian. 



3350. The lower jaw of a Babyroussa, with the crowns of the molar teeth much 

 worn. Hunterian. 



3351. The lower jaw of a Babyroussa, with the grinding teeth more worn, and 



