PnENACODUS. 
177 
inferior 
fossa. 
border of the 
jaw does not rise noticeably below the masseteric 
Measurements of mandible and teeth. 
M. 
Length of the last four molars.. 0. 0575 
Length of the last premolar. . 0. 0135 
Width of the same.... . . 0. 0085 
Height of the crown of the last premolar . . ... 0.0080 
Length of the penultimate molar.. . 0. 0140 
Width of the same. 0. 0125 
Length of the last molar... 0. 0140 
Width of the same.. . 0.0100 
Height of the crown of the last molar.... 0.0070 
Depth of the ramus at the second true molar. 0. 0310 
Thickness of the same.... 0. 0170 
Portions of both mandibular rami of another animal present some addi¬ 
tional features. One of them contains the last three molars, which are more 
worn than those of the specimen previously described. The section of the 
tubercles given b}^ the attrition is characteristic. Those of the internal 
and posterior ones are subcircular; those of the outer are subcrescentic, the 
anterior angle being produced forward and inward. The ramus is relatively 
shallower than in the specimen above described, as can be seen by the 
measurements appended. This is thought to be due to the fact that the jaw 
of the latter has been somewhat crushed by pressure on its sides, so that the 
measurement of depth exceeds the normal. 
Measurements. M. 
Length of the true molars..... 0. 040 
Length of the penultimate molar. 0. 013 
Width of the same..... 0. 012 
Depth of the ramus at the penultimate molar. . 0. 023 
Thickness of the ramus at the penultimate molar. 0.017 
The measurements of a third individual are as follows: 
Measurements. M. 
Length of the last molar. . . 0. 015 
Width . .. 
( between two posterior tubercles. 0. 005 
Elevation of the anterior cusp from base... 0.008 
Width of the penultimate molar behind. 0. 010 
The jaws and teeth of this species represent an animal of the average 
size of the White-lipped Peccary Dicotyles lahiatus. 
12 G R 
