756 MAMMALIA. 



much modified in form, consists of the same pieces as in the human 

 subject, and in like manner has the pubic arch and foramina fully 

 completed. 



(2156.) The cranium and face are made up of numerous bones, easily 

 recognizable, as they correspond in their general arrangement with those 

 composing this part of the skeleton in the lower Yertebrata. Their de- 

 velopment in the facial region is large, in proportion to the strength of 

 the muscles moving the lower jaw ; and they are so disposed as to form 

 buttresses to resist the powerful pressure of the teeth, as well as to 

 enclose cavities wherein are lodged the organs connected with the senses 

 of smell and of vision. One example will answer our present purpose, 

 and we have selected the skull of the Pig as one calculated to show a 

 medium development of the whole series. 



(2157.) In the face we find on each side two bones entering into the 

 composition of the upper jaw, into which teeth are implanted ; these are 

 the superior maxillary (fig. 380, 18), and the intermaxillary (17). These 



Fig. 380. 



Skull of the Pig. 



bones, moreover, bound extensively the cavity of the nose, and, together 

 with the palatine process of the palate bone (fig. 381, 22), constitute the 

 bony palate, or roof of the mouth. The nasal bones (fig. 380, 20, 20) com- 

 plete the upper part of the face ; and, being in contact along the mesial 

 line, arch over the nasal chamber. 



(2158.) The orbit is bounded anteriorly by the lacrymal bone (c), and 

 ihejugal or malar bone (6). Its posterior boundary is generally want- 

 ing, as the external angular processes of the jugal and frontal bones do 

 not meet. 



(2159.) The orbital cavity is principally formed by processes derived 



