_ Fig. ](). ruHfnce vicwof tlie maKks. (No. 2 to the left, No. 1 to the 

 right). 



I'ifi. 11. Thrcc-quartcr profile view (;f {l.c masks. (No. 2 to the left, 

 No. 1 to the right;. 



I wish to express my indebtedness to Mr. Gordon Smith for taking the 

 photographs of the masks. 



