OSTEOLOGY OF THE SKULL OF PARIOTICHUS 139 



EXPLANATION OF PLATE 



(The figures on this plate are natural size) 



Fig. 1. — Top view of skull of Pariotichus aguti Cope. 



Fig. 2. — Lateral view of skull of Pariotichus aguti Cope. 



Fig. 3. — Base of skull of Pariotichus, species unidentified. 



Fig. 4. — Floor of skull of Pariotichus restored from three specimens. 



1, parietal; 2, squamosal; 3, postorbital; 4,quadratojugal; 5, jugal; 6, frontal; 

 7, prefrontal; 8, nasal; 9, maxilla; 10, premaxillae; 11, dentary; 12, angular; 

 13, coronoid; 14, surangular; 15, tabulare; 16, vomer; 17, pterygoids; 18, 

 palatines; 19, transverse; 20, quadrate; 21, basisphenoid; 22, basioccipital; 

 23, stapes; 24, exoccipital; 25, supraoccipital; 26, postparietal. (As the 

 surface sculpture was not well preserved in any of the specimens no attempt 

 was made to reproduce it exactly in the drawings.) Lined areas are restored. 



