﻿J 874. 255 



The Arharioolas, I may add in conclusion, differ from all in not 



having the temporal fossa bridged by bone, the zygomatic process of the 

 sc^uamosal being c^uite rudimental. 



t 



lEx^plaiiation of Plate II. 



Upper view of skull oi Arbor ico la rufogularis^ nat. size. 

 Side view of tlie same skull, nat. size. 



Upper view of skull of a young individual of the same species, nat. size. 

 Side view of the same skull, nat. size. 



Upper view of skull of Tinamus robustus, magnified two diameters. 

 (After Parker). 



Sro. Superorbital chain of ossicles ; I. lacrymal ; p. o. postorbital process ; s, o. m. 

 unossified portion of superorbital membrane. 



Fig. 



1. 



Fig. 



2. 



Fig. 



3. 



Fig. 



4, 



Fig. 



5. 



