ERRATA. 



P. 38, 1. 30, for connection, read correction. P. 39, 1. 35, for these, read those. P. 

 h0,\.\7,%r extracting, read extorting. ^.^2,1. 211 , fox found, re&A formed. P. 

 92, 93, where Gnathodon occurs, the specific name should be in the masculine gen- 

 der; as G-nathodon flexuosus , for Gnathodon flexuosa. P. 198, 1. 19, for crystals of 

 crenic acid, read crystals supposed to be crenates. P. 205, 1. 38, for C. S. Ward, 

 read C. J. Ward. 



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