706 ■ WILLIAM J. SINCLAIR 



MEASUREMENTS OF PROTAPIRUS ROBUSTUS 



mm 



Length of inferior molar-premolar series - - - 128 to 130 



Length of inferior premolar series - - - - - - - 60 



Length of inferior molar series (approximate) - - - - 70 



Length of diastema .....--.- 46 



Length of symphysis measured on lower side - - - - 71 



Depth of ramus below alveolus of Pm. 2 - - - - - - 48 



Depth of ramus below alveolus of Pm. 4 ----- 49 



Depth of ramus below alveolus of M. 3 - - - - - - 43 + 



Length of radius - - - - - - - - -181 



Breadth of proximal end of radius - - - - - - - 45 



Breadth of distal end of radius ------- 39 



la this connection, may be mentioned a second specimen, 

 (No. M 1525 University of California Pal. Museum), representing 

 probably another new species, obtained by the writer in the 

 uppermost beds of the John Day system, on Johnson Creek, 

 Grant county, Oregon. The horizon is considerably higher than 

 that from which Protapiriis robustiis was obtained, and appears to 

 be faunally distinct. It is characterized by the remains of 

 numerous individuals of a camel belonging to the genus Pro- 

 tomeryx and by a rodent generically new. The tapir remains are 

 of a young animal and are not complete enough to characterize 

 specifically. They comprise fragments of a jaw with which three 

 incisors and the second inferior premolar are preserved. The two 

 large incisors, apparently the inferior median pair, are two-thirds 

 as large as the corresponding teeth in P. robustiis. They are 

 spatulate in shape and slightly cupped. The anterior face is 

 marked by delicate growth lines. The third incisor is an exceed- 

 ingly small tooth with the crown 3^-""" broad. Imperfect preser- 

 vation of the symphysial region renders it impossible to make 

 any statement regarding the canine. The second premolar of 

 the right side is the only one of the cheek teeth perfectly pre- 

 served. This tooth is entirely unworn, and was just appearing 

 through the gums at the time of the animal's death. In this 

 tooth, thetetartoconid is much larger than in P. robustiis and the 

 junction of the metaconid with the tetartoconid is much more 

 complete, forming a cross crest but slightly notched. A ridge 



