HOG-TRIBE. 555 



deciduous molar (ib. d 3) has the crown divided into three lobes 

 and a posterior tubercle ; each lobe being subdivided into an outer 

 and an inner cusp with irregular, subtuberculate surfaces : the 

 lobes increase in thickness from the first to the third, the entire 

 tooth bearing a strong resemblance in miniature to the corres- 

 ponding deciduous molar of the Hippopotamus. 



The second and third deciduous molars appear before the 

 first, and the first and third incisors, with the canine, rise into 

 place before the second incisor: the development of this tooth 

 and of the first molar completes the caducous dentition. The first 

 permanent true molar (ib. m 1) next comes into place behind the 

 deciduous series, and the first premolar (ib. p 1) appears in front 

 of that series, not displacing any predecessor : the second permanent 

 true molar (ib. m 2) also cuts the gum before any of the deciduous 

 teeth are shed.(l) The fall of the milk-teeth follows the order of 

 their appearance : the iter dentis of each of the three replacing 

 premolars (' dents de remplacement' of Cuvier) opens upon the 

 inner side of the alveoli of the teeth which they displace. With 

 respect to the anterior and smaller premolar {p 1) I am doubtful 

 whether to regard it as belonging to the first or the second dentition : 

 it maintains its place sometimes longer than the adjoining posterior 

 premolars {p 2, p 3), and would, therefore, appear, like its analogue 

 in the Bear and Dog, to be the first of the permanent series : 

 but I have seen an instance in an Indian Wild Boar, in which, 

 on the right side of the upper jaw, a premolar with a larger 

 crown (PI. 141, fig. 3, p. 1') had been developed between the 

 small anterior premolar and the second normal premolar, and a 

 little to the inner side of the anterior tooth, which it seemed, 

 therefore, to have been destined to succeed, but had not displaced; 

 there being five premolars and three true molars, or eight teeth 

 on that side of the upper jaw. (2) The third large true molar 



(1) The figure which Cuvier gives (Ossemens Fossiles, 4to. 1822, torn, ii, Cochons, pi. 1, 

 fig. 4 & 6), as the dentition " d'un jeune animal qui n'a encore que des molaires de lait :" 

 exhibits the first and second true molars which are certainly not milk-teeth, together with the 

 small anterior premolar which, hkewise, is not displaced by a successor as a true milk-tooth 

 always is. 



(2) Cuvier regards the anterior small molar (p 1) as the first of the deciduous series, and 

 describes its displacement and succession by a * dent de remplacement,' as constant, though 



