AKCHAEOTHERIUM. 



65 



as well developed as that external; and the anterior half forms a quadrilateral 

 pyramid, more elevated than the lobes behind. 



The deciduous true molar with its anterior portion broken away is contained in 

 one of the fragments of a lower jaw, and is sufficiently perfect to show it keeps up 

 the suilline character of the animal, in having an additional pair of conical lobes 

 to the normal number of the permanent true molars. 



The enamel of the deciduous teeth is thinner and less corrugated than that of 

 the permanent teeth. 



The species is named in honor of the late distinguished Dr. Samuel George Mor- 

 ton, of Philadelphia. 



MEASUREMENTS. 



{Taken from, the young specimen.) 



Distance from meatus auditorius to the infra-orbital foramen . 

 Distance from meatus auditorius to the lachrymal tubercle 

 Bi'eadth of head at the transverse fronto-malar suture . 

 Greatest breadth at lowest part of ossa malarum .... 



Length from occipital condyles to anterior part of penultimate premolar 



Distance inferiorly between the glenoid articulations ' . 



Greatest breadth inferiorly of the temporal fossae 



Greatest length inferiorly of the temporal fossaj .... 



Narrowest part of inter-temporal region ..... 



Greatest breadth at squamous suture ...... 



Breadth at lachrymal tubercles ....... 



Breadth at posterior margin of infra-orbital foramina 

 Breadth of hard palate between the middle true molars 



les. 



Inches 



8 



6 



5 



9 



7 







8 



9 











4 



6 



3 



3 



3 



6 



2 



3 



2 



9 



4 



1 



2 



8 



1 



5 



SUPERIOR MOLARS. 



Antero-posterior. Transverse. 



Diameter of seventh molar 9f 



Diameter of sixth molar . . . . . . . . llf- 



Diameter of fifth molar ........ 10 



Diameter of fourth molar . . . . . ■ .9? 



Diameter of third molar . . . . . . .12} 



Diameter of last temporary molar ...... 10 



Diameter of penultimate molar . . . . . .11} 



lines. 



9 lines. 

 11} 

 10 



9 



7 



7} post. 4 ant. 



INFERIOR MOLARS. 



Diameter of seventh molar 12 lines. 8 lines. 



Diameter of sixth molar .12 8} 



Diameter of fifth molar 1Q\ " 7} ^| 



Diameter of fourth molar .....■•• 1^4 



