232 



975. The left lower canine of a species of Equus. 



976. The first molar, right side, lower jaw, of a species of Equus : it presents 

 a proportionally shorter antero-posterior diameter than in the' recent 

 Horse. 



977- The second molar, left side, lower jaw, of a species of Equus : the enamel 

 is rather more plicated and the antero-posterior extent of the crown rela- 

 tively greater than in the recent Horse. The internal median inflection 

 of enamel is double in the present specimen. 



978. The third molar, left side, lower jaw, of a species of Equus : it manifests 

 the same differential characters, compared with the recent Horse, as does 

 the preceding specimen. 



979. The last molar, left side, lower jaw, of a species of Equus: the posterior 



angle of the crown is less produced than in the recent Horse. 



The following specimens of teeth are from the lower jaw of an aged Horse ; 

 the crown in each having been worn down to the fangs, which are elongated. 



980. The fourth molar of the right side. 



981. The fifth molar of the right side. 



982. The sixth and last molar of the right side. 



983. The fourth molar of the left side. 



984. The fifth molar of the left side. 



985. A middle lower molar with the central folds of enamel quite obliterated 

 and worn down to a common dentinal base, which has become smooth 

 by friction. 



986. The fractured atlas of a species of Equus. 



987- The vertebra dentata, with most of its processes broken off, of a species 

 of Equus. 



988. The second dorsal vertebra of a species of Equus. 



989. A portion of the os sacrum of a species of Equus. 



990. The vertebral extremity of one of the anterior ribs of the right side of 

 a species of Equus. 



