86 OSTEOLOGICAL GALLERY. 



the Paca (Ccelogenys pacd), whose zygomatic arches are much en- 

 larged and swollen, and protect a pouch opening into the mouth. 



The second Suborder (Duplicidentata) (Div. F) consists of the 

 Hares and Rabbits (Lepus) and the Pikas (Lagomys). Their chief 

 peculiarity is that some bones of their skulls are singularly im- 

 perfect, consisting in parts merely of a sort of bony network, 



Fig. 45. 



Skull of Common Hare (Lepus europceus). 

 i, incisors ; m, molars j pm, premolars. 



especially in the neighbourhood of the olfactory chamber. They 

 possess postorbital processes, very large palatal foramina, and 

 united shin-bones. 



Order VII. UNGULATA. 

 Suborder PROBOSCIDEA. 



Numerous teeth and skulls of both species of Elephant, and of 



[Case 9.] different ages, are placed in Case 9; several other skulls and six 



skeletons (of an African male, Sumatran female, a gigantic Indian 



tuskless male, two tuskers, and one female) are exhibited in the 



adjoining Saloon. 



The Elephants (Case 9) are characterized by the strength and 

 solidity of all their bones, and by their incisor teeth being deve- 

 loped into long and formidable tusks. 



Their skull (fig. 46) presents many special features : it is pro- 

 portionately very large and high, and the occipital surface looks 

 obliquely upwards, instead of backwards as in other Mammals. 



