46 OREODON. 



Inches. Lines. 

 Depth below the hinder portion of the lower middle premolar ... 11 



Length of entire series of upper teeth 4 3 



Length of entire scries of lower teeth 4 4 



Length of scries of upper molar teeth ........ 3 4 



Length of series of lower molar teeth 3 3 



Length of series of upper true molar teeth ....... 1 10 



Length of scries of lower true molar teeth 2 



Antero-posterior diameter of last upper molar ...... 9 



Antero-posterior diameter of last lower molar ...... 11 



Length of crown of the canine teeth ....... 7 



Extent of hiatus behind the upper canine ....... 3 



Extent of hiatus between canines and incisors ...... 1} 



2. A very much mutilated skull, with the zygomata, upper superficial portion of 

 the face, orbital margins, and rami and greater portion of the base of the lower 

 jaw broken away. The specimen is very much fissured, appaj^ently from exposure 

 to the weather since its exhumation. All the teeth, except the crowns of the 

 canines and incisors, remain on both sides. 



The form, proportions, and size of the specimen correspond pretty closely with 

 that first indicated. 



From Messrs. Culbertson's collection. 



MEASUREMENTS. 



Inches. Lines. 



Length of head from occipital condyles to the anterior incisive alveoli . . 7 5 



Breadth of face at infra-orbitar foramina . . . . . . .1 81 



Breadth of face above first premolar . . . . . . . .1 7 J 



Breadth of face at roots of incisors just in advance of the upper canines .1 2 J 



Height of symphysis of lower jaw ........ 1 7 



Depth of lower jaw below second premolar ....... 1 J 



Length of series of upper molars ........ 3 5 



Length of series of lower molars ........ 3 3 



Length of series of upper true molars . . . . . . .1 9 J 



Length of series of lower true molars . . . . . . .1 11 



3. A much broken anterior portion of a skull, agreeing very closely in its form 

 and proportions with the corresponding part of the preceding specimens. 



From Capt. Van. Vliet's collection. 



MEASUREMENTS. 



Inches. Lines. 



Breadth of face at infra-orbitar foramina ....... 1 9 



Distance from the latter to the frontal angular processes .... 1 4} 



Length of series of upper molars ........ 3 5 



Length of series of lower molars 3 4 



Length of series of upper true molars ....... 1 9 



Length of series of lower true molars 2 



4. An anterior portion of a skull containing all the true molars and one last pre- 

 molar, with fragments of the others. It is accompanied by a portion of lower jaw 

 containing the last premolar and the succeeding two true molars. 



