ERRATA. 



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



" 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 " Saurioidichnites," 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 Pachydactyli, insert a new species, " 5. O. tuberosus. 



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



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



