COKYPHODON. 
233 
Length of the penultimate molar.... ... .... 0. 033 
Width of the same.. 0, 030 
Length of the first true molar ....... 0. 026 
Width of the same... 0. 028 
Length of the last premolar.. 0. 017 
Width of the same.... 0. 025 
Length of the last inferior molar.... 0. 037 
Width of the same ... 0. 023 
Elevation of the posterior crest of the last inferior molar. 0.015 
Length of the first inferior true molar... 0. 025 
Width of the same.. ... 0. 017 
Length of the free portion of the canine....... 0. 045 
Diameter of the same j autero posterior.... 0.020 
In association with this cranium were found various bones of the skele¬ 
ton. First in order comes the atlas^ of which the greater part was obtained. 
It is of moderate length, and has the condyloid cup well excavated. The 
transverse process is horizontal and flat, its transverse extent exceeding its 
longitudinal. The vertebral canal enters it behind just above the posterior 
margin, and issues on the inferior face a little behind the anterior margin, 
at a point which marks the middle of the long axis of the vertebra. The 
end of the transverse process is not widened, but is a little thickened. 
Neural arch destroyed. The axis is preserved with the loss of its neural 
arch. The body is flattened and subquadrate in outline, expanding to the 
faces for the atlas, and terminates anteriorly in a remarkably long odontoid 
process. It is not keeled on the middle line below. The posterior articular 
face is vertical, not oblique, and somewhat concave. The faces for the atlas 
slope well baclnvard. The .odontoid is two-fifths the length of the axis; 
its superior face descends obliquely to the inferior face near the end; the 
inferior articular surface extends its entire length. 
Measurements. 
M. 
Vertical diameter of the posterior face of the atlas.... 0. 030 
Length of the base of the transverse process of the atlas. 0. 037 
Length of the transverse process of the atlas .. 0. 036 
Longitudinal width of the atlas near the end... 0. 028 
Total length of the axis . 0. 091 
Length of the odontoid process. .. 0. 038 
