Am. Jour. Sci., Vol. XVII, 1904. 



Plate XXI. 



JDxternaZ or maxillary view, 



pr pr 



Palatal or internal view. 



2 



; rtie W P a 1 



4 4 f 



/ />* 



pwo^ I P/>* 



2 ■ ^ 





" r 



mts fa 



me 



i>r 



m5 



?pfL ?m£ 



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