46 



ON THE EXTINCT MAMMALIA OF 



that it is smaller. The upper molars are very little longer in their proportions than 

 relates with the size of the lower molars contained in the portion of a lower jaw 

 described in the succeeding chapter and referred to Hij(Bnodon cruentus, so that I atn 

 led to suspect that the latter is probably not a distinct species. 



The measurements derived from three skulls of Hyoinodon Jiorridiis, including the 

 one with the proportionately small teeth, above indicated, are as follows : 



Hysenodon horridus. 

 Length from occipital condyle to upper incisive 



alveoli, . . . . 12J inches. 



Length from do. to end of nasals, . . 11^ " 



" post-glenoid tubercle to upper in- 



cisive alveoli, . .11 " 



Length of sagittal crest, 



Length along middle of temporal fossa, . 63 lines. 



Distance from occipital condyle to last molar 



tooth, , . . . . 66 " 



Breadth of cranium at parietals where widest, 



" " where narrowest, 16 " 



Height from palate to end of sagittal crest, 42 " 

 Length of forehead from sagittal crest to nasals, 17 " 

 Length of frontal at middle, . . . 25* " 



Breadth of forehead at supra-orbital processes, 46 " 

 Distance from last molar to end of sagittal crest, 53 " 

 Distance from second premolar to internasal 



suture, . •. . . .34 " 



Length of nasals, . . . . 62 " 



Breadth of nasals at frontal angular processes, 24 " 

 Breadth of nasals at ends of premaxillaries, 14 " 

 Breadth of face at ant-orbital margins. 

 Breadth of face at infra-orbital foramina. 

 Breadth at canine alveoli. 

 Height of end of nose. 

 Breadth of end of nose, . ■• . 



Distance from post-glenoid tubercle to last 



molar, , . . . .48 " 48 



Breadth of face at back of alveolar border, .46 " 

 Length of alveolar border to front of incisive 



alveoli, . . . . . 86 " 



Length of lower jaw from condyle to do., 118 " 



* Partially estimated. 



40* 



23 

 26 

 20 

 17 



16 



38 



42 



70 

 102 



