134 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



alveolae. The maximum interval between alveolae is about 2 mm. 

 The septa between the alveolae are in most instances complete. On 

 the right mandible in front of the 29th tooth, counting forward from 

 the hindmost, the alveolae were obliterated by exostosis. Except for 

 a slight inward slope, the roots of the teeth were implanted nearly 

 vertically in the alveolae behind the sjnnphysis. Along the symphysis, 

 however, the roots were implanted obliquely in the alveolae, sloping 

 more backward than inward. The distance between opposite alveolae 

 immediately in front of the posterior end of the symphysis is 22.5 mm., , 

 and 5.5 mm. at the level of the 29th alveolae, counting forward from i 

 the hindmost on the left mandible. In the right mandible, 12 alveolae 

 (in an interval of 117 mm.) were located behind the level of the 

 posterior end of the symphysis, and in the left mandible 11 alveolae 

 (in an interval of 103.5 mm.) were so situated. The individual 

 alveolae, which are essentially complete in preservation, vary in 

 anteroposterior diameter from 6 to 9 mm., and in transverse diameter 

 from 7 to 8.5 mm. 



On the outer surface of the right mandible there are at least three 

 nutrient foramina, and, from these grooves of varying lengths, extend 

 forward. These nutrient foramina are located below the 8th, 10th, 

 and 17th alveolae, counting forward from the hindmost, as well as 

 other smaller foramina located anterior to these, but partially obscured 

 by fractures. Nutrient foramina are located on the outer surface 

 of the left mandible (pi. 12, fig. 2) below the 5th, 10th, 14th, and 20th 

 alveolae. Commencing below the 20th alveola, there are in addition 

 however, three narrow grooves, one above the other, that extend 

 forward for at least 70 mm., but at a lower level on the outer face. 



The dorsal edge of each mandible ascends gradually to the coronoid 

 process, which has a thickened dorsal border. Although each 

 coronoid process is bent inward, this condition may have resulted in 

 part from crushing. The opposite coronoid processes are now sep- 

 arated by an interval of 102 mm. The distance from the apex of the 

 coronoid process (163 mm.) to the hindmost alveola on the left 

 mandible is equivalent to about 31 percent of the total length of the 

 mandible as preserved. 



Behind the hindmost alveola and on the inner face of each ramus 

 there is a large orifice for the dental canal. Posterior to this point, 

 the inner wall is reduced to a low thin strip along the ventral border 

 of the mandible. The outer wall of the mandible in this region con- 

 sists of a thin shell of bone that is now markedly convex except for the 

 shallow concavity below and in front of the coronoid process. 



The ventral margin of the left ramus is continued backward from 

 the symphysis in a shallow curve toward the angle, the lower border 

 being destroyed for a distance of 25 mm. anterior to the condyle. 



