224 
CORYPHODON. 
disproportionately small size. In crania of such relative sizes, if the hemi¬ 
spheres preserved the same proportions, those of T. roulinii should present 
two-thirds the linear dimensions of those of the C. elephantopiis. The actual 
measurements are twice those of the latter, linear; therefore three times as 
long and wide. This gives a proportion of bulk of twenty-seven to one. 
Measurements. 
M. 
Length of the cranium from the incisive border to the convexity of the occipital 
*■ condyle.... ..... 0. 450 
Width of the cranium at the posterior part of the zygomatic arch. 0.290 
Depth of the cranium at the last molar. 0.145 
Length from the incisive border to the posterior edge of the foramen infraor- 
hitale exterius ... 0.130 
Length from the incisive border to the tuberosity of the lachrymal bone .. 0.173 
Width of the anterior nares........ 0.007 
Width at the supraorbital tuberosities. ... 0.160 
Width behind the supraorbital tuberosities..... 0.135 
Greatest width of the parietal bones ... 0.154 
Expanse of the posterior angles of the parietal bones. 0.138 
Elevation of the occiput, including the condyles, at the middle. 0.130 
Elevation of the occiput at the sides... ... 0.148 
Length of the palatal surface... 0. 240 
Length of the nareal trough to the foramen ovale ... 0. Ill 
Length of the oval tuberosities of the basioccipital... 0. 022 
Length (perpendicular) of the postglenoid processes.. 0.030 
Width of the palate in front of the canines. . 0.112 
Width of the palate at the canines ..... 0.141 
Width of the palate at the diastema.. . 0.009 
Width of the palate at the last molars (inclusive). . 0.125 
Width of the palate between the first premolars.. 0.045 
Width of the palate between the last true molars.. . .:.. 0.047 
Width of the palatal notch.. 0. 028 
Width between the foramina ovalia . 0.040 
Width between the external borders of the postglenoid processes. 0.155 
Width between the external borders of the mastoid processes. 0.175 
Width of the basisphenoid axis. . . 0.037 
Width of the foramem magnum ..... 0. 034 
Axial length to the line of the canine teeth.. 0.055 
Axial length to the line of the premolar teeth. 0.106 
Length of the premolar series. 0. 073 
Length of the molar series. ... 0. 085 
Length of the first premolar.L.. 0.010 
Width of the same.. . .. 0.017 
Length of the fourth premolar. 0. 021 
Width of the same.. 0.027 
