156 



University of California Publications in Geology [Vol. 10 



No.456 



59 



No.418 

 51.7 



No. 637 

 49.4 



No.63E 

 48.5 



13.6 



13.9 



ol2.5 



all.8 



17.6 



15.9 



al6.3 



al6.2 



14.1 



al4.7 



13.3 



13.4 



18.4 



16 



16.4 



16.4 



13.4 





14.5 



al5 



16.2 





15 



14.8 



transversely as the posterior half. M 5 differs from the corresponding 



tooth of Hapalops and Mcgalonyx in the presence of well-marked 

 lateral grooves. The anterior and posterior faces resemble those in M 5 . 



<j <i <i <i < <j << <j <j 



cog cog cog cog oi* ajg cog cog cog 



Measurements of Km Km Km Mm Kn Kb Km Km 



Dentition |gj gg« ggj ggj ggj |g« »gj |g« »g« 



to o % <*> o ^ o « o "Sn o "S^o "£ d o « o o « H o 



rt^jjz: c; °~ cis c3«^ a co & c3^x! 



BQ . f5 ta • fi co.Cl to.d to.fl eo . Pi co. PI ta.eJ cg . S 



, o d , O s . O cj .On! . O cfi . O C3 . O c3 . O c3 . O e3 



ZZK 5?S?P3 g£« fcfcK ZZK 



Greatest length of su- 

 perior molar series, 



alveolar measurement 61.6 mm. 62.8 61.5 57.5 62.3 65.4 



M 5 , greatest anteropos- 

 terior diameter 12 12 12.1 al2.3 12.4 10.4 9.7 9.9 



M-, greatest transverse 



diameter 12.9 13 13 al3.7 14.3 10.5 11.2 11.9 



M 3 , greatest anteropos- 

 terior diameter 13.3 13 ol4 13.8 11 



M 2 , greatest transverse 



diameter 16.8 16.9 al6.8 18.9 14.4 



M>, greatest anteropos- 

 terior diameter 13.2 13 12.8 13 12.1 11.2 10.8 



M 1 , greatest transverse 



diameter 17 17.2 17 17 18.3 14.4 13.5 



M 5 , greatest anteropos- 

 terior diameter 8.7 7.6 7.3 «7.8 8.8 7.3 7.2 7.5 



M-, greatest transverse 



diameter 13.6 14.4 13.8 al2.9 16 11.5 10.5 11.3 



Greatest length of in- 

 ferior molar series, No. 636'* 

 alveolar measurement 57 54.7 51.7 



M.2, greatest anteropos- 

 terior diameter 13.6 



Mi, greatest transverse 



diameter 16.5 



M5, greatest anteropos- 

 terior diameter 14.2 13.5 



M5, greatest transverse 



diameter 17 17.5 



Mj, greatest anteropos- 

 terior diameter 14 15 14 



Mj, greatest transverse 



diameter 15.6 15.8 15 



* This specimen may belong to cranium 313. 

 », approximate. 



The single tooth, no. 10495 Univ. Calif. Coll. Palae., of Nothro- 

 therium previously described by the writer from Rancho La Brea, was 

 assigned to the superior dentition chiefly on similarity of its cross- 

 section to that of the second alveolus. It was remarked, however, that 

 the Rancho La Brea specimen differed from no. 8702 from Potter 



