INSTITUTE OF SCIENCE, PHILADELPHIA. 



15 



narrower and not flattened as in the Tiger, and the basi-occipital is more 

 strongly carinated and deeply impressed at the sides for muscular 

 attachment. 



The occiput is much less narrowed above than in the Tiger, and its 

 ridges and depressions are more strongly produced. 



The glenoid articulation is of less transverse extent, but is wider fore and 

 aft, especially at the inner part, so that in outline it appears more transverse- 

 ovoid than elliptical. 



The hard palate is less level than in the Tiger, and exhibits the same 

 conspicuous depressions represented in Dr. Burmeister's figure of the same 

 part in Machairodits neogaeiis. 



Comparative measurements of the skull of MacJiairodus floridanus, the 

 cast of the skull of M. neogaeus of Brazil, from the Paris Museum speci- 

 men, and Dr. Burmeister's figures of the same animal of the Argentine 

 Republic are as follows ; 



Length from occipital condyle to incisive 

 border, ...... 



Breadth of skull at widest part of zygoma. 



Depth of skull at post-glenoid tubercle. 



Distance from back of zygoma to incisive 

 border, ...... 



Breadth at mastoid processes, 



Width of narrowest portion of cranium. 



Breadth at paramastoid processes, . 



Breadth at occipital condyles. 



Breadth of occiput above the latter, 



Transverse diameter of occipital foramen. 



Length of occipital condyle from above 

 downward, ..... 



Width of space between the auditory 

 bulla;, ..... 



Length of mastoid process, . 



Thickness fore and aft, 



Breadth of face at sectorial teeth, . 



Breadth of face at canines. 



Fore and aft space of the teeth, 



Fore and aft space of two molars. 



Transverse space of incisors, . 



Width fore and aft of canine alveolus. 



Width fore and aft of premolar " 



Width fore and aft of sectorial molar al- 

 veolus, ...... 



Florida. 



Brazil. 



Argentine. 



285 



mm. 



330 mm. 



330 



mm. 



190 



(( 



230? " 



230 



u 



125 



it 



160? " 



164 



i( 



210 



t( 



225 " 



245 



t( 



126 



a 



140 " 



143 



t( 



57 



a 





57 



a 



105 



11 





1 12 



tt 



63 



" 





60 



i( 



100 



Ki 









30 



tt 









38 



21 " 







33 " 







21 " 







150 " 





170 



94 " 



112? " 



1 12 



140 " 



163 " 



146 



55 " 



63 •' 



62 



58 '• 



55 " 



66 



40 " 



53 " 



45 



16 " 



18 " 



18 



37 



42 



43 



