128 



University of California Publications. [Geology 



M 3 , anteroposterior diameter 1.5mm 



M 3 , transverse diameter 2 



P 4 , antero-posterior diameter 2.5 



P 4 , transverse diameter 2 



M„ antero-posterior diameter 1.75 



M 1; transverse diameter 2.25 



M 3 , antero-posterior diameter 2 



M,, transverse diameter 2 



ENTOPTYCHUS ROSTRATUS, 11. sp. 

 PI. 14, Pigs. 8 and 9. 

 Type.— Cranium, No. 1651, Univ. of Cal. Palaeont, Coll. 

 Locality.— Promerycochoerus beds, Upper John Day. Haystack Valley, 

 Wheeler Co., Oregon. 



Skull and rostrum longer than in any other described species 

 of Entoptych us. 



Compared with E. sperryi, the rostrum is not only longer but 

 deeper, although the width is the same. The nasals are narrow 

 posteriorly and are not separated by a frontal process. Anter- 

 iorly they are as wide as in E. sperryi. The interorbital region 

 is imperfectly preserved and it is not possible to determine its 

 character. The upper teeth are badly worn. P 4 is apparently 

 the largest tooth in the superior series, the molars decreasing in 

 size posteriorly. 



The specific name refers to the great length of the rostrum. 



Measurements. 



Length of skull, supraoceipital to premaxillae inclusive 55.5mm 



Interorbital width, approximate 7 



Width at middle of rostrum 11 



Depth of rostrum at incisive foramen 11 



Length of rostrum from base of P 4 to anterior end of premaxillae.. 27. 5 



Length of nasals 27.5 



Length P 4 to M 3 inclusive, on alveolar border 9 



P 4 , antero-posterior diameter 2.2 



P 4 , transverse diameter 2 



M l , antero-posterior diameter 1.9 



M 1 , transverse diameter 2 



H YPERTRAGULiUS , sp. 

 PL 14, Fig. 3. 



All doubt regarding the inferior dental formula of Hypertra- 

 gulus is removed by the specimen illustrated on Plate 14, Pig. 3, 

 (No. 1343, Univ. of Cal. Palaeont. Coll.) from the Promery- 



