ERRATA. 



Page 105, bottom line, for "baryta 72," read "76." 





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187, line 13 from top, for " Progree," read " Progres." 

 208, line 13 from bottom, for "xvi," read "xlvi." 

 282, line 8 from bottom, read "Robert C. Winthrop, Esq." 

 294, line 14, for " Saunoidichnites," read "Sauroidichnites." 



" line 22, for "five," read "four." 

 " line 25, for "two," read "one." 



line 27, for " thirty three," read " thirty four." 

 308, line 5, for "Fig. 10," read " Fig. 10a." 



314, line 13, for " Slate," read " Sandstone." 



315, line 15, and page 316, line 7, for " fig. 9," read "Plate IV." 



317, under PacMjdactyli, insert a new species, " 5. O. tuberosus." 



318, line 9, for " thirty two," read " thirty four." 

 350, note, for "p. 136," read "p. 36." 



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