Cyclopidius (Pithecistes) Cope, etc. 415 



mal fossa. The infra-orbital foramen is single and 

 located above the middle of P^. The frontals are much 

 reduced and very narrow. A rather shallow but well 

 marked depression separates the median sagittal ridge 

 from the slightly elevated supra-orbital borders. The 

 malar part of the zygoma is exceedingly thick and deep, 

 while the squamosal portion is comparatively weak, 

 except for the great expansion above the glenoid articu- 

 lar surface. The brain-case is relatively very small. 



The rami are massive, deep, and heavy. The inferior 

 border is much thickened and, below the anterior molar 

 series, there is an osseous tubercle on each ramus. The 

 position of this small tubercle is suggestive of that in 

 the entelodonts, except that in the latter the size is very 

 much greater. There are but two incisors in both dental 

 series. This species is nearest to C. hrevifacies Cope, 

 but larger, and shows marked differences. 



Measurements of Holotype. 



mm. 



Skull, length, occip. condyles to prosthion, inc . 143.5 



Bizygomatic diam 104.5 



Diam. of postorbital constriction 24 



Max. width of brain-case 46 



Width above P^ 40 



Width between middle of orbits 60 



Depth of malar below middle of orbits 28 



Ant.-post. diam. of facial vacuities 47 



Ramus, total length 131 



Depth, coronoid to angle 88 



Depth below M, 35.5 



Width below M, 16.2 



Superior dental series, with canine, length 78.2 



Superior molar series, length 44.2 



Superior premolar series, length 30.5 



Inferior dental series, with P^, length 70.5 



Inferior molar series, length 40.5 



Inferior premolar series, with P^, length 27.5 



Chelonocephalus schuclierti, subgen. et sp. nov. 



(Figs. 4-6.) 



Holotype, Cat. No. 10123, Y. P. M. Middle Miocene, Badlands, near 

 Hermosa, South Dakota. 



The t^TDe material, which was collected in 1894 by H. F. 



Wells, consists of a well preserved skull, lacking the 



