132 



University of California Publications. [Geology 



Measurements. 



Basilar length of cranium from the anterior border of the al- 

 veolus of P s to condyle inclusive 79.5 mm 



Width between superior orbital rims 42 



Length of sagittal crest from point of confluence of temporal 



ridges 29 



Depth of skull to alveolar border through middle of orbit 33 



Length from point of union of temporal ridges to fronto-parietal 



suture 11 



Antero-posterior diameter of orbit 26.5 



Transverse diameter of orbit 21 



Width of brain case at postorbital constriction 30 



Greatest width of brain ease 35.5 



Width of palate at M» 22.5 



Length P 3 -M 3 inclusive 31 



Length M'-M 3 inclusive 22 



M 1 , greatest antero-posterior diameter 6.5 



M 1 , transverse diameter on triturating face through anterior 



crescents 7 



M 2 , greatest antero-posterior diameter 7 



M 2 , transverse diameter on triturating face through anterior 



crescents 8 



M 3 , greatest antero-posterior diameter 9 



M 3 , transverse diameter on triturating face through anterior 

 crescents 9 



ELOTIIERIUM CALKINSI, n. Sp. 

 PI. 15. 



Type. — Cranium and mandible, several cervical vertebrae and portions of 

 fore and hind limbs, No. 953, Univ. of Cal. Palaeont. Coll. 



Locality. — Upper part of the Promerycoehoerus beds, Bridge Creek, 

 Wheeler County, Oregon. 



Chin rounded, without knob-like bosses. Posterior mandi- 

 bular protuberances small and hollow. Jugal processes plate- 

 like, with thickened rib, directed posteriorly, not extending be- 

 low inferior mandibular border. Size large. 



The teeth are greatly worn and partially shed, with closure of 

 the alveoli, indicating the extreme senility of the individual. P 1 to 

 P 3 are double-fanged, with simple, laterally compressed crowns. 

 P 1 is separated from the canine by a short diastema (9.5 mm). 

 Between P 1 and the alveolus of P 2 there is a considerably greater 

 interval (27 mm). In the figure (PI. 15) P 2 is not shown, as this 

 tooth has been shecl from the left maxillary. P 3 is in practically 

 continuous series with P 4 and the molars. P 4 is supported by 



