Fig. 30. 



Fig. 31. 









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Fig. 32. 



Fig. 33. 



Fig. 34. 



Fig. 35. 



Magnification, 10 x. Etched with acidified ferric chloride. — These photo-micrographs, to- 

 gether with those on the following pages, have been reduced one-eighth in the engravings. 



