28 



AGllIOCHOERUS. 



the margin of the internal of tlie posterior pair of lobes, the other the contiguous 

 extremity of the summit of the inner of the same pair of lobes. 



The fourth premolar, like the true molars and the corresponding tooth of the 

 upper jaw, also has four lobes. Those external have the same form as in the true 

 molars, Init that anterior is larger than the one posterior. The inner lobes are 

 reduced representatives of those homologous in the true molars, and still preserve 

 the same form, but as they retain their connection with one another, they are 

 placed at the posterior three-fourths of the position of the tooth. 



The third premolar is formed by a single, large, broad, demiconoidal crown, in 

 which, however, may be traced a constitution of two outer lobes corresponding to 

 those of the true molars, the posterior of -which has become almost entirely fused 

 with the anterior, but is still distinguishable by a depressed line externally, and a 

 well marked cul-de-sac internally. 



All the inferior molars have two fangs, and in the last of the series the posterior 

 consists of a confluent pair. 



The enamel upon the teeth described is everywhere smooth, or is only very 

 slightly corrugated. 



MEASUREMENTS. 



Breadth of faoo from one malar bone to the other, posterior to the orbits 



Breadth of forehead at post-orbital processes of os frontis 



Distance between the infra-orbital foramina . 



Diameter of the orbits ...... 



Height of forehead above the alveolar margin 

 Distance between the posterior molars anteriorly . 

 Distance between the third premolars .... 



Length of line of the posterior six superior molars 



Length of line of the five inferior molars 



Length of line of superior true molars .... 



Length of line of inferior true molars .... 



Greatest antero-posterior diameter of the posterior superior molar 



Greatest transverse diameter of the posterior superior molar 



Greatest height of the posterior superior molar 



Greatest antero-posterior diameter of first superior true molar 



Greatest transverse diameter of first superior molar 



Greatest antero-posterior diameter of fourth premolar 



Greatest transverse diameter of fourth premolar . 



Greatest antero-posterior diameter of second premolar 



Greatest transverse diameter of second premolar . 



Height of the second premolar .... 



Antero-posterior diameter of posterior inferior molar 

 Transverse diameter of posterior inferior molar 

 Antero-posterior diameter of first true molar 

 Transverse diameter of first true molar 

 Antero-posterior diameter of fourth premolar 

 Transverse diameter of fourth premolar 

 Antero-posterior diameter of third premolar . 

 Transverse diameter of third premolar . 



Inches. 



Lines 



4 





2 



4 



1 



6i 



1 





1 



10 



1 



2 



1 



2 



3 





3 





1 



10 



2 



IJ 





9 





lOJ 





3J 





7i 





8 





6 





6i 





4i 



6 



6i 



4J 



6J 



4 



4i 



3 



