Fig. 66. 



Fig. 65. 



Fjg. 



* A 





•JUL 



J. 



Fre. 67. 



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HsJ ' 



v^ 





Fig. 69. 



Fig. 66, magnification, 12 x . Figs. 67 and 69, magnification, 72 x . Fig. 66, unetched. 

 Figs. 67 and 69, etched with ammonia and hydrogen peroxide. 



