1 6 



TRANSACTIONS OF THE WAGNER FREE 



Florida. 



136 mm. 



50 " 



Brazil. 



Argentine. 



50 mm. 



25 



11 





25 



60 



n 



53 mm. 



55 



46 



n 



43 " 



38 



21 



i( 







14 



a 







14 



(t 







5 



it 







14 



n 







8 



t( 







17 



li 







II 



a 







Length of palate to incisor alveoli, 

 Width transversely of glenoid articula- 

 tion, ...... 



Width fore and aft of glenoid articula- 

 tion, ...... 



Depth of face at infra-orbital margin, 

 Depth of zygoma, .... 



Vertical diameter of infra-orbital foramen, 

 Transverse, " " " " 



First incisor alveolus fore and aft, 

 First incisor alveolus transversely, . 

 Second incisor alveolus fore and aft, . 

 Second incisor alveolus transversely, 

 Third incisor alveolus fore and aft. 

 Third incisor alveolus transversely, . 



The fossils found in .association with the Machairodus skull are mostly 

 the remains of young animals and are perhaps remnants of the feasts of the 

 great carnivore. Those of the Horse consist of a broken cervical vertebra, 

 six lower molar and five incisor teeth. The specimens accord in size and 

 other respects with the corresponding parts of the ordinary sized Domestic 

 Horse, presenting no anatomical marks of having belonged to a different 

 species. The molar teeth indicate at least three different individuals ; half 

 of them, including the last of the series, being entirely unworn. Another 

 last molar is just sufficiently worn so as to exhibit the usual characteristic 

 folding of the enamel of the triturating surface ; and a third specimen is 

 about one-fourth worn away, exhibiting the same arrangement of the enamel 

 folding. Of the incisor teeth, two lateral ones are folded at the sides and 

 have a wide groove behind, but do not enclose an enamel pit as in the other 

 incisors which pertain to the intermediate ones of the series. 



Remains of Horses, not distinguishable in anatomical character from the 

 corresponding parts of the Domestic Horse, are of frequent occurrence in 

 our quaternary deposits in association with those of well-recognized species 

 and genera of extinct animals. Some of these with little doubt pertain to 

 the Domestic Horse and are accidental associates of the other fossils, but 

 there appears strong evidence that many if not most of them actu- 

 ally belonged to an indigenous species of Horse, whose osteological and 

 dental characters, so far as we know them, were the same as in the domestic 

 animal. In this view, the remains of the Horse found in association with 

 the Machairodus skull may be regarded as having pertained to the species 

 which I have elsewhere named Equus fraternus* 



* Proc. Acad. Nat. Sc. 185S, 11. 



