168 



University of California Publications. 



[Geolo<;y 



The pelvis is heavy and narrow, indicating' an individual of 

 the male sex. Though no pelvis of EuceratJierium has been 

 identified, the type specimen is judged to be of male sex. Por- 

 tions of the skulls of eight individuals in the collection are re- 

 ferable to EuceratJierium and the differences noted in them indi- 

 cate difference of sex. The elements of the hind limbs, like those 

 of the fore limbs, are heavy and rugged compared with the 

 typical Ovinae. The greater and lesser trochanter, gluteal 

 tubercle and all processes for muscular attachment are strongly 

 developed. 



Affinities. — Preptoceras has interesting resemblances to 

 Buclorcas and to Ovibos, though not nearly related to either. It 

 probably bears somewhat the same degree of relation to Ovibos 

 that Budorcas does. Its closest affinity is with its contemporary 

 Euceratherium. It stands in about the same relation to the 

 Ovinae as does the latter and is tentatively placed in that sub- 

 family. Preptoceras and Euceratlicrium have unique character- 

 istics in common and will probably have to be placed in a group 

 by themselves when studied further. 



Measurements. 



Basilar length of cranium from the anterior border of the 



alveolus of P 3 to condyle, inclusive 300 mm 



Greatest length of frontal from fronto-nasal suture to occiput, 



approximate 143 



Width between superior orbital rims 160 



Width across bases of horn-cores 144 



Width of palate at M 3 89 



Greatest extent of molar arches measured between inferior 



borders 180.5 



Depth of molar arch below orbit 48 



Antero posterior diameter of horn-core at base 96 



Transverse diameter of horn-core at base 77 



Length of superior dental series on alveolar border 139.7 



Antero-posterior diameter across head of humerus 114 



Length of humerus 300 



Length of radius 305 



Length of scapula 305 



Length of a metacarpal 180 



Length of 1st phalanx of fore foot C5.5 



Length of 2nd phalanx of fore foot 37.5 



Length of a hoof of fore foot 58 



