ERRATA. 
P. 38, 1. 30, for connection, read correction. P. 39,1. 35, for these, read those. P. 
50, 1. 17, for extracting, read extorting. P. 52, 1. 27, for found, read formed. P. 
92, 93, where Gnatho don n occurs, the spediGe name should be in the masculine gen- 
der; as Gnathodon flezuosus, 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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