Explanation of Plate XXIII. 



Figure i. — Ost. Coll. 3210. From Cave 51. Skull of child about 7 years of age, presenting 

 syphilitic necrosis of the frontal bones, and an abnormal condition of the 

 metopic suture. Anterior view. 



Figure 2. — The same skull. Lateral view. 



Figure 3. — Ost. Coll. 3199. From Cave 42. Adult female skull, exhibiting typical Aymara 

 or highland deformation. Anterior view. 



Figure 4. — The same skull. Lateral view. 



Figure 5. — The same skull. Superior view. 



