DESCRIPTION OF THE FIGURES. 



Fig. I, represents the skull viewed from the base ; FiG. 2, 

 as seen from the left side and partly from the front ; Fig. 3, 

 represents the roof of the skull ; and Fig. 4, the inner side of 

 the right half. 



The references in the different figures are as follows : i , 

 the premaxilla ; 2, the maxilla ; 3, the palate bone ; 4, the 

 vomer ; 5, the pterygoid ; 6, the basi-sphenoid ; 7, the basi- 

 occipital ; 8, the exoccipital ; 9, the opisthotic ; 10, the 

 squamosal; 11 , the quadrate ; 12, the quadrato-jugal ; 13, the 

 jugal ; 14, the post-frontal; ij, the columella auris : a thin 

 plate of cartilage, which covered the inner division of the 

 tympanum, has been removed to expose part of the columella ; 

 16, the parietal ; 18, foramen for exit of external carotid artery ; 

 19, the posterior nares ; 20, part of the opisthotic ; 21, occi- 

 pital condyle ; 22, orbito-temporal fossa ; 23, articular surface 

 for mandible ; 25, anterior nares ; 26, supra-occipital bone ; 

 27, frontal bone ; 28, naso-prefrontal bone ; 29, prootic ; 30, 

 epiotic, anchylosed to the supra-occipital ; 31, canal for entry 

 of carotid artery ; 32, 'alisphenoid bone ; 33, cartilaginous 

 inner wall of labyrinth ; 34, foramen for exit of internal carotid 

 artery. 



