EDENTATA OF THE SANTA CRUZ BEDS. 263 



illary and its external face projects well outside the line of the other 

 teeth, almost as much as in Eucholceops. The diastema between 1 and i 

 is longer than in most species of Hapalops. Of the.molariform teeth, a , 



- and A are transversely oval, differing only in size, * being the broadest 

 transversely and shortest antero-posteriorly ; ^ is nearly cylindrical, which 

 is a very unusual feature, though materials are lacking to determine 

 whether this is an individual abnormality, or whether it is truly charac- 

 teristic of the species. 



In the mandibular dentition the resemblance to Hapalops is even closer; 



- is high, erect and bevelled by attrition and the diastema is quite short, 

 much shorter than in the upper jaw ; 2 and -5 are transversely oval and T, 

 which is unusually large, is of the ordinary, subcylindrical shape. 



MEASUREMENTS. 



Upper dentition, length 067 5-, width 009 



" " " S--&- 039 Lower dentition, length 048 



J-, length (/'. e., antero-posterior di- " " " ^_f 030 



ameter) 009 T , length 007 



" width (t. c., transverse diameter) 007 " width 006 



^, length 0085 5-, length 008 



" width 012 " width 012 



&, length 008 3-, length 008 



" width 0135 " width 012 



A, length 008 5 7 , length o i o 



" width 01 2 " width 0095 



i length, 0075 



The skull resembles that of Hapalops and, in a somewhat less pro- 

 nounced degree, that of Eucholozops. The occiput is quite high in 

 proportion to its width and the supraoccipital does not extend at all upon 

 the dorsal side of the cranium ; the upper contour of the skull rises very 

 gently from the occipital crest to the parietal eminence, which is incon- 

 spicuous; from that point it pursues a nearly horizontal course to the 

 fronto-nasal suture, whence it descends very gradually to the muzzle. 

 Occipital and sagittal crests are present, but are not very prominent and 

 the latter ends upon the frontals by dividing into two very obscurely 

 marked temporal ridges. The preorbital or facial region is relatively long 

 and high and the preorbital fossae of the maxillaries are very deep on the 

 ventral side, where they notably constrict the palate, but become very 

 shallow dorsally, so that they are hardly visible from above. The nasals 



