MKMOlliS OF THE NATIONAL ACADEMY OF SCIENCES. 



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These lateral deformities are not to be profitably considered under the head of plagiocephaly 

 as defined by Broca. According to this author a certain depression of the frontal bone ou one side 

 accompanies a depression of the parietal on the opposite side in the condition to which he applies 

 this name. While in this collection there are some true plagiocephalic skulls, the majority hav- 

 ing the posterior lateral flattening have not the accompanying frontal flattening. Hence they 

 have been all first studied together with regard to the posterior flattening only. Of a skull thus 



Jfo. 4. 10. 73.27. 29.30. 



Flo. 27. Occipital depression. Group K. 



flattened on the left side we say it has left posterior flattening, although it may have right plag- 

 iocephaly, and of a skull thus flattened on the right side we say it has right posterior flattening, 

 although it may have left plagiocephaly. In short we study this deformity first without regard to 

 plagiocephaly. 



