



910 



The five following skulls show the modifications which depend upon extreme age : 



5886. The skull of an aged Female. 



The calvarium has been detached, showing the cranial parietes to be thin, with little diploe. 

 The chief modifications are presented by the bones of the face, especially the jaws, in which 

 the alveolar processes have been absorbed, and the lower jaw is reduced to a slender arch of 

 bone. The paroccipital tubercles are defined. 



This skull resembles the subject of the figure illustrative of the eifects of the loss of teeth 

 in both jaws, given by Hunter in his Work ' On the Teeth,' pi. vii. 



Hunterian. 



5887. The skull of an aged Male, with the short, broad, rounded type of cranium. 



It shows a similar absorption of both jaws, with the thinning and partial absorption of the 

 bony palate. 



Presented by Sir William Blizard, F.R.S. 



5888. The skull of a similarly aged Male, with the elongated narrow type of cra- 

 nium. Hunterian. 



5889. The skull of an aged Female, with the cranium of medium proportions. 



In both this and the preceding skull the supramastoid ridges are well marked. 



Hunterian. 



5890. The cranium of an aged Frenchman. 



The mastoids are small, and have each a deep irregular groove externally : the squamosals 

 are likewise unusually small, and the primitive distinction between the mastoid and squamous 

 parts of the temporal is indicated by an unusually deep and well-marked angle between those 

 elements at the additamental suture. The paroccipitals are small, but distinct. 



Presented by Dr. Leach, F.L.S. 

 The following crania have been preserved on account of some individual peculiarities : 



5891. The cranium of a European, with the frontal region narrow, but unusually and 

 unsymmetrically protuberant. 



A section of this part shows no undue thickening of the bone ; but an accordance of the 

 cranial cavity with the external configuration. The occipital region is prominent. The par- 

 occipital tubercles are small, though distinct. The maxillo-intermaxillary sutures are distinct 

 on the palate. The alisphenoids are unusually broad, and are confluent with the parietals. 



Hunterian. 



