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KEFERENCES TO PLATE XXI. 



Head of Choeropsis Liberiensis, reduced one-half. 



Fig. 1. View of the right side. 



The upper jaw contains from before backwards, the two right incisors, the canine, the premolar, which has 

 no successor, the temporary molars, and the anterior two permanent true molars. In the lower jaw are the 

 right incisor, the canine, the premolar without a successor, the first permanent premolar with its apex just 

 protruded internally to and in advance of the next tooth, which is the first temporary premolar, then follows 

 the second permanent premolar just protruding, the temporary true molar, and the anterior two permanent 

 true molars. 



The teeth of the left side, so far as they might be seen in this view of the head, have been purposely left 

 out, so as not to obscure those represented. 



Fig. 2. Upper view of the skull. 



