T^NIODONTA. 
165 
Measurements. 
M. 
Length of the ramus to aud iucluding the last molar. 0.128 
Length of the same to the base of the coronoid.. 0, 098 
Length of the five molars alveoli. 0. 075 
Length of the alveolus of the penultimate........ 0. 013 
Width of the same.. 0. 013 
Length of the alveoli of the first and second teeth . 0.025 
Length of the alveolus of the second tooth... 0.010 
Width of the same... 0.023 
Length of the alveolus of the first tooth... 0. 010 
Width of the same..".. 0. 009 
Width of the iiiner side of the incisive alveolus... 0.023 
Depth of the ramus at the antepenultimate molar... 0.053 
Depth of the same at the antepenultimate molar. 0.030 
Length of the crown of the inferior molar.... 0. 015 
Width of the same.... 0.013 
Elevation of the same- (greatest). 0.013 
A nearly entire inferior incisor accompanying some bones of uncertain 
reference appears to belong to this species. It forms nearly a regular arc 
of 73° of a circle of O^.OOS in diameter, but is not in one vertical plane. 
The anterior face is turned somewhat outward; the external face of the 
tooth thus becoming oblique, while the other is nearly plane. The posterior 
border is rounded, and maintains a uniform thickness and a uniform distance 
from the anterior face to its distal termination. This termination is an 
abrupt truncation about an inch short of the apex, which is worn from a 
thin enameled edge backward and outward. The mark of attrition of the 
superior tooth is distinct three-quarters of an inch below the truncation, on 
the inner side. The sides of the tooth are shallowly concave, the outer 
most so. The enamel band extends a little farther back on the outer side, 
and its section is widely convex without any grooving, except a shallow 
concave line near the inner border. The apex is perfectly smooth; lower 
down there are faint longitudinal ribs.v 
Measurements. 
M. 
Length of the incisor on the convexity. . 0.135 
Antero-posterior diameter below the apex. . 0.030 
Antero-posterior diameter at the base. ..... 0. 031 
Transverse diameter below the apex anteriorly.. 0.016 
Transverse diameter belew the apex posteriorly. 0.010 
