PACHYDERMATA. 861 
Fig. 470. | 
- Ally. ge 
Vertical section of the skull of a young Boar. 
minores almost along their whole length and 
mask the pterygoid processes, so as to give a 
very peculiar appearance to the base of the 
cranium. 
The bones of the face are remarkable for 
their massive developement, but as their posi- 
tion is sufficiently indicated in the next wood- 
cuts, it would be useless to particularize them 
further, 
Ribs and sternum.—The thoracic cavity 
throughout all the Pachydermatous genera is 
enormous in proportion to the great bulk and 
excessive weight of the viscera. The ribs, in 
fact, are continued backwards almost to the 
pelvis, and from their extraordinary size and 
Occipital bone of a young Boar, shewing its division 
into four pieces. 
Tn the above three figures the parts indicated are 
as follows :—a, a, frontals; 6, b, parietals; c,c, 
12, ¢ 2, ¢3, occipital; d, temporal; e, lateral 
processes of occipital bone; f, sphenoid; g, 
supra-orbital plate of os frontis; h, os lacrymale ; 
i, jugal bone; &, superior maxillary; J, inter- 
maxillary; m, nasal; n, inferior maxilla; 0, Fig. 473. 
ossified nasal cartilage ; p, palatine. 
_turbinated lamine are very large, so that the 
Belicacy of the sense with which they are con- 
“nected is evidently only inferior to that of the 
carnivorous quadrupeds. 
The sphenoid occupies the same position as 
the skull of Man, and in the hog tribe is 
similar in its shape and the general ar- 
f rae of its processes to the human. In 
the Elephant the anterior and posterior clinoid 
esses are but slightly developed, so that the 
base of the cranium internally has a very flat 
appearance, whilst externally, such is the enor- — 
mous developement of the sphenoidal cells, Skull of Sus Larvatus. 
that they stretch on each side beneath the ale Letters as in figure 465. 
in 
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