28 AGRIOCHOERUS. 
the margin of the internal of the 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, but 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 cw/-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. 
Inches. Lines. 
i 
Breadth of face 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 . : ; ; : : i 64 
Diameter of the orbits : : ¢ : 
Height of forehead above the alveolar margin : 10 
Distance between the posterior molars anteriorly 
Distance between the third premolars 5 
Length of line of the posterior six superior molars 
Length of line of the five inferior molars 
co Co eS ee eS eS be 
SS) 
Length of line of superior true molars . 2 1 10 
Length of line of inferior true molars . . é 2 14 
Greatest antero-posterior diameter of the posterior superior molar 9 
Greatest transverse diameter of the posterior superior molar . 5 : : 103 
Greatest height of the posterior superior molar 3} 
Greatest antero-posterior diameter of first superior true molar 74 
Greatest transverse diameter of first superior molar 8 
Greatest antero-posterior diameter of fourth premolar 6 
. Greatest transverse diameter of fourth premolar . 9 6s 
Greatest antero-posterior diameter of second premolar ‘At 
Greatest transverse diameter of second premolar 3 
Height of the second premolar. 4 3 i ; " 5 A oe 34 
Antero-posterior diameter of posterior inferior molar. é ; ° Ao Pall 
Transverse diameter of posterior inferior molar 6 
Antero-posterior diameter of first true molar 64 
Transverse diameter of first true molar 4} 
Antero-posterior diameter of fourth premolar 63 
Transverse diameter of fourth premolar 4 
Antero-posterior diameter of third premolar . 4} 
3 
Transverse diameter of third premolar . . ° 0 
