562 



3374. The second upper molars, m 2, of the same animal. 



The enameled part of the crown has been about half worn down, but a considerable body 

 of dentine surrounded by unpolished cement remains before the fangs are sent off. These 

 are four in number, with some accessory processes, and are bent upwards and backwards at 

 an obtuse angle to the crown. 



Mus. Brit. 



3375. The last upper true molars, m 3, of the same animal. 



About one half of the fore part of the grinding surface has come into use. Nineteen 

 columnar processes of dentine, six of which form a linear series along the centre and are 

 surrounded by thirteen peripheral columns, were in course of formation at the base of this 

 complex tooth. 



The four grinders of the right side of the above series, Nos. 3372 3375, are figured in 

 situ in tab. xix. of the ' Philosophical Transactions ' for 1799, in illustration of Home's paper 

 above cited. The teeth are drawn somewhat reduced in size, but not in a just proportion 

 to the reduction of the size of the cranium and of the upper tusks. Nor are the relative 

 lengths of the crown and fangs correctly given. The crown of the first true molar e. g. is 

 represented of the same length as that of the fourth premolar which precedes it, and nearly 

 of the same length as that of the second true molar ; whereas in the original it is much 

 shorter, in consequence of having been longer in use. 



Mm. Brit. 



3376. The fourth lower premolars, p 4, of the same animal. 



Like the corresponding teeth of the upper jaw, only the tip of the obtusely rounded crown 

 is worn. 



Mm. Brit. 



3377. The first lower molars, m 1, of the same animal. 



Their crown is almost worn down, and their roots have been absorbed, like their homo- 

 types above ; but the crown is narrower in proportion to its length. 



Mus. Brit. 



3378. The second lower molars, m 2, of the same animal. 



The crown is as little worn as in the corresponding teeth above : it consists of ten columns 

 of dentine, each surrounded with enamel and the whole connected together with cement. 

 The lower tooth differs from the upper one in its inferior breadth, but resembles it in other 

 respects, especially in the curvature of the fangs, which are also four in number. The poste- 

 rior part of the crown is worn a little flat by pressure against the succeeding large molar. 



Mus. Brit. 



3379. The last lower molars, m 3, of the same animal. 



The crown has been worn in the same proportion as in the last upper molars, and the con- 

 stituent dentinal columns are of nearly equal length ; but they were still in course of forma- 



