ARCHAEOTHERIUM. 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.) 
Lines. Inches. 
Distance from meatus auditorius to the infra-orbital foramen . 8 6 
Distance from meatus auditorius to the lachrymal tubercle 4) 9 
Breadth of head at the transverse fronto-malar suture 7 (0 
Greatest breadth at lowest part of ossa malarum : a aS 9 
Length from occipital condyles to anterior part of Reculsnte EO : LO 0 
Distance inferiorly between the glenoid articulations 4 6 
Greatest breadth inferiorly of the temporal fossee 3 3 
Greatest length inferiorly of the temporal fosse 3 6 
Narrowest part of inter-temporal region 2 3 
Greatest breadth at squamous suture 2 9 
Breadth at lachrymal tubercles 4 1 
Breadth at posterior margin of infra-orbital forantite 2 8 
Breadth of hard palate between the middle true molars 1 5 
SUPERIOR MOLARS. 
Antero-posterior. © Transverse. 
Diameter of seventh molar é . ' : . 3 . 9% lines. 9 lines. 
Diameter of sixth molar . ’ é : ; : / ral ol Co dP tg 
Diameter of fifth molar . : : . : ; t E SES IPARSS Ore’ 
Diameter of fourth molar ‘ : ; . : ; pO Fass Oureax’e 
Diameter of third molar : ‘ 2 : : : Sey eT i 
Diameter of last temporary molar. : é : : 0 Ocean Sho 
Diameter of penultimate molar : : : : : op Lili ace 74 post. 4 ant 
INFERIOR MOLARS. 
Diameter of seventh molar : 3 ; , : : . 12 lines. 8 lines. 
Diameter of sixth molar . 3 : , : E ‘ tig 1D, @s Sai 
Diameter of fifth molar. : : : : : : Hy LOR cS (hae 
Diameter of fourth molar . : : . ; 5 , eS TRS Ge Sse 
