88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



A.M. 



No. P.U. P.U. 



2064 No. No. 



Type 1 1225 1 1226 



Upper molar series, M'-M', inclusive 23.0 22.5 21.9 



C, anteroposterior diameter (at alveo- 

 lus) : greatest transverse diameter. . . 4.5 :. . . 5.4: 3.2a 4.5 : 3.0 

 P\ anteroposterior diameter : greatest 



transverse diameter 4.5 : . . . 5.0 : . . . 3.5 : . . . 



P*, anteroposterior diameter : greatest 



transverse diameter 6.5 : . . . 7.0a : . . . 6.9 : 2.5 



P', anteroposterior diameter : transverse 



diameter* 7.3a : . . . 7.00 : 5.0a 7.0 : 6.0a 



P*, anteroposterior diameter : transverse 



diameter 6.2 : . . . 5.3a : 7.0 . . . : 6.5a 



M\ anteroposterior diameter : transverse 



diameter* 7.0a : 8.5c 6.6a : 8.9 6.2 : ^.^ 



M', anteroposterior diameter : transverse 



diameter 8.0a : 10.00 8.4a : 10.5 T-Z : 10.3 



M', anteroposterior diameter : transverse 



diameter 8.60: 11. oa 8.9:11.5 8.4:11.6 



U.S.N.M. 

 No. 

 20397 

 Length of lower cheek tooth series, Pi 



(at alveolus) -M3, inclusive 58.0a 58.1 



Lower premolar series, Pi (at alveolus )- 



P4, inclusive 31.5 32.3 



Lower molar series, M1-M3, inclusive 26.5 26.0 



Pi, anteroposterior diameter (at alveo- 

 lus) 4-50 4-4 



P2, anteroposterior diameter : greatest 



transverse diameter 5.5a : 2.2a 5.0a : . . . 



P3, anteroposterior diameter : greatest 



transverse diameter 7.2 : 2.5a 7.0 : 3.0 7.0a : . . . 



P4, anteroposterior diameter : greatest 



transverse diameter 7-5 : • • • 6.8 : 4.0 7-i : 3-9 



Ml, anteroposterior diameter : transverse 



diameter of talonid 7.0 : . . . 6.60 : . . . 6.8a : 5.4 



M2, anteroposterior diameter : transverse 



diameter of talonid 8.0 : . . . 7.8 : 6.0 8.2 : 6.4 



Ma, anteroposterior diameter : transverse 



diameter of trigonid 1 1.6 : . . . 12.0a : 6.3 . . . : 6.8 



a, Approximate. 



• Measurements of posterior upper premolars are taken anteroposteriorly across outer por- 

 tion and transversely perpendicular to outer margin. Those of upper molars _ are taken 

 anteroposteriorly perpendicular to anterior margin and transversely across anterior portion 

 of tooth. 



LEPTOREODON (HESPEROMERYX) EDWARDSI so Stock, 1936 

 Type. — An upper cheek tooth series, P^ to M^, inclusive, C.I.T. 

 No. 1839. 



50 Illustrated in Stock, 1936, pi. I. 



