OF THE WHITE KIVEE, BEDS OF MONTANA. 265 



ward opposite the post-glenoid. It is thin and antero-posteriorly compressed. A hint of 

 it is seen in 0. culbertsoni (Princeton Col., No. 10062). Another process extends back- 

 ward and outward near the postero- interior face of the post-glenoid. A much larger- 

 space is left between the tympanic and the basioccipital than in 0. culbertsoni. The 

 ridge or convexity that bounds the inner side of the glenoid surface is much more promi- 

 nent than in that species. The basioccipital is broader. 



• 



Measurements. 



M. 



Length of skull from front of canine to back of paroccipital process 192 



Height of skull above P-L 060 



Height of skull above Mi 064 



Width of skull at canines 055 



Width of skull at anterior of orbits 104 



Height of narial opening over Pf 040 



Width of narial opening over P- L 030 



Width of molar under middle of orbit 022 



Width of palate between canines 039 



Width of palate between second premolars 040 



Width of palate between last molars 037 



Width of incisive foramina 0095 



Length of incisive foramina 012 



Length of foramen ovale 009 



Width of foramen ovale 005 



Length of molar-premolar series 090 



Length of premolar series , 045 



Length of molar series 045 



Width of Pi 006 



Width Of P* °°8 5 



Width of both nasals, greatest 030 



Eucrotaphus helence, sp. nov. 

 Type No. 57. 



The skull with the lower jaw. The anterior part of the skull and mandible, the 

 occipital crest and zygomatic arches are gone. It was found northeast of Toston, in a 

 bed of clay which contained nodular layers. 



It was a young individual but nearly full grown, judging by the sutures of the skull. 

 1 1. has its temporary premolars. All the molars are fully erupted, but the last molars are 

 unworn. 



The nasals are quite broad above the third premolars. They narrow gradually ami 

 uniformly backward, ending in points in a plane with the anterior of the orbits. They 

 are convex. The lachrymal pits are nearly circular and quite deep. The anterior pro- 

 longations of the frontals terminate in a plane with the fourth premolars. The lachrymal 



