186 



ON THE EXTINCT MAMMALIA OF 



Lines. 



Breadth of forehead at middle of orbits, . . . . .54 



Breadth at aii1>orbital prominence, . . . ... .40 



Breadth at infra-orbital foramen, . . . . . .28 



Breadth above second true molars, . . . . . . 40 



Height of orbital entrance, . . . . . . .24 



Transverse diameter of do., . . . . . .21 



Breadth of occipital foramen, . . . . . .20 



Breadth at outer part of glenoid cavities, . . . . .90 



Breadth of palate between first true molars, .. . . .17 



Length of upper true molar series, . . . . . .33 



Antero-posterior diameter of first true molar, . . . . lOJ 



Transverse " «".... lOi 



Antero-posterior diameter of second true molar, . . . .Hi 



Transverse " " " .... Hi 



Antero-posterior diameter of last true molar, . . . . 9i 



Transverse " " " . . . . . 9i 



Antero-posterior diameter of upper temporary true molar, . . .10 



Transverse " " " "... 8 



Antero-posterior diameter of last temporary premolar, . . .11 



Transverse " " " jDosteriorly, . . 7i 



Depth of posterior border of loAver jaw, . . . . .44 



Depth of jaw below first permanent true molar, . . . .23 



Length of series of lower true molars, . . . . .33 



Antero-posterior diameter of last true molar, . . . .Hi 



Transverse " " . . . . 7i 



Antero-posterior diameter of second true molar, . . . ' . 12i 



Transverse " " " . ... Si 



Antero-posterior diameter of first true molar, . . . . lOi 



Transverse " " " . .. . .7 



Antero-posterior diameter of last permanent premolar, . . . 12i 



Transverse " « « « ... 6 



Length of crown of last permanent premolar, . . . . 8i 



2. A much mutilated and fractured specimen, consisting of the upper jaw, or facial 

 portion of a skull, without the orbits and anterior extremity, from an old individual 

 in which the lobes of the true molars are obliterated from attrition. The specimen 

 belonged to Dr. Evans' Mauvaises Terres collection, and is now in the Smithsonian 

 Institution. 



Its measurements are as follow : 



