PLATE XXVII 



Female skulls in dorsal view, to show developmental stages 



Fig. i. Fourth year group, No. 509. 



Fig. 2. Fifth year group, No. 465. 



Fig. 3. Sixth year group, No. 515. 



Fig. 4. Seventh year group, No. 522. 



Fig. 5. Eighth year group, No. 475. 



Fig. 6. Ninth year group, No. 529. 



Fig. 7. Group of tenth year and over, No. 525. 



