244 E. L. Troxell — Entelodonts in Marsh Collection. 



GENERAL SUMMARY. 



The purpose of such a paper is to put at the disposal of 

 science the fine collection of entelodonts in the Peabody 

 Museum. The known species are listed and the standing 

 and a brief description of each are given, as well as a list 

 of the new species proposed at this time. In the discus- 

 sion of the teeth and bony processes on the skull and 

 mandibles, it is reasoned that the latter were for muscle 

 attachment, and facilitated the movements of the jaws in 

 eating and may also have supported cheek pouches. The 

 anterior mental processes may well have guarded the 

 points of the canines, as in the sabre-toothed cats, or in 

 Dinoceras. 



The great diversity of the material did not permit the 

 reference of every specimen to a known species, nor did 

 the fragmentary material warrant making a new species 

 for each strange specimen. It was found most practica- 

 ble, therefore, to group allied specimens, even though at 

 times widely different, in order to emphasize their rela- 

 tionship and to arrange the whole in a systematic way. 



Summary of Measurements 



Skull length, condyles to incisor 

 border 



Width across muzzle at alveolus 

 of P 2 



Width of rami back of anterior 

 tubercles 



Depth of ramus at P, 



Depth of ramus at M 2 



Diameter of P 4 , transverse 



Diameter of P 4 , ant.-post 



Diameter of M 2 , transverse .... 



Diameter of M 2 , ant.-post 



Upper premolar length .......... 



Upper molar length 



Diameter of P 4 , transverse 



Diameter of P 4 , ant.-post 



Diameter of M 2 , transverse 



Diameter of M 2 , ant.-post 



Lower premolar length 



Lower molar length 



CO 



Hi 



«> o 



Hi 



oc 



. o 

 ft 1-1 



CO . 



. o 



OS P-, 



mm. 



mm. 



mm. 



mm. 



392 



430 







58.0 



62.0 







45.4 







49.0 



46.6 





56.0 



60.0 



51.6 



61.7 



68.0 



72.3 



21.0 



21.8 



24.6 





21.0 



18.2 



24.3 





24.7- 



25.3 



28.4 





24.3 



24.0 



27.0 





103.0 



114.0 







67.6 



67.0 



81.0 





12.8 



14.8 



16.2 





28.8 



25.0 



30.5 



29.0 



17.9 



18.4 



20.5 



22.0 



24.9 



23.6 



26.0 



26.0 



112.0 





141.5 



135.0 



71.7 



70.5 



75.9 



76.0 



