AMERICAN BATS — HANDLE Y 



09 



0, Secondary cusp absent; no trace. 



1, Secondary cusp incipient, in the form of a shoulder, not separated from primary 

 cusp by a notch. 



2, Secondary cusp present, separated from primary cusp by a notch. 



Frequently, the degree of development of the secondary cusp of I^ 

 is not the same on both sides. When absent in one tooth and incipient 

 in the other, it was indexed as 0.5; when absent in one and present 

 in the other, as 1; when incipient in one and present in the other, 

 as 1.5; etc. 



The degree of development of the secondary cusp in each population 

 was determined by averaging individual indexes. Thus, a population 



GREATEST LENGTH 



BRAIN CASE 

 BREADTH 



INTER0R8ITAL 

 BREADTH 



MAXILLARY TOOTH ROW 



POSTPALATAL LENGTH 



Figure 1. — Cranial measurements of Euderma and PUcotus. 



