545 



true molar. The germ of the second true molar is exposed in its formative alveolus. In the 

 left ramus the germs of the permanent canine, of the fourth premolar and of the second true 

 molar are exposed, together with the fangs of the last deciduous molar and first true molar. 

 Those of the former are widely divaricated, and inclose the germ of the successional tooth, 

 p 4 : the fangs of the first true molar are longer and more parallel, and its permanent nature 

 is indicated by the absence of any trace of a successor. 



3258. A longitudinally bisected cranium of an older Wild Boar (Sus Scrofa). 



In this the second true molars have come into place, but not the second premolars, although 

 the third and fourth premolars have been acquired. The germs of the last true molars are 

 exposed in their sockets. 



3259. The two rami of the lower jaw of the same skull. 



The right shows the fourth premolar, with the first and second true molars in place, and 

 the second and third premolars just appearing above their sockets, the third being most ad- 

 vanced ; the germ of the last true molar is exposed. In the left ramus the inner parietes of 

 the molar alveoli have been removed, showing the long fangs of the teeth in place, and the 

 germ of the last true molar. 



3260. A longitudinally bisected cranium of an older Wild Boar (Sus Scrofa). 



In this specimen all the premolars, with the first and second true molars, are in place ; but 

 the germ of the crown of the last true molar has not yet left its formative socket, nor has the 

 second deciduous incisor been shed. It is retained on the outside of the crown of its suc- 

 cessor. 



3261. The lower jaw of a Wild Boar, at a corresponding stage of dentition. 



3262. A mutilated right ramus of the jaw of a Wild Boar, at a similar stage of den- 

 tition. 



3263. A longitudinally bisected cranium of an adult Wild Boar (Sus Scrofa). 



The sockets of the molar series are exposed on the left side. The first premolar, canines 

 and incisors are wanting in this specimen. 



3264. The lower jaw of the same skull, bisected at the symphysis, and with the inner 

 parietes of the molar series removed. 



4 A 



