ERRATA. 



Page 17, second line of last paragraph, for calcareous, read ai^illaceous. 

 112, 14th line from top, for and, read with. 

 123, 17lh line from top, for 18, read 14. 

 129, 11th line from top, for wearing, read weathering. 



137, for Tentaculites irregularis ( n.s.), read Tentaculites gyracanthus ( Echinus gyracanthus, 



Eaton, Geol. Textbook, 1832, pa. 37, pi. f.l6). 



138, for Plate Ixxxiv, read Plate Ixxxv. 



139, 14th line from Ijottora, for three in scries of five, read five in three series. 

 172 &, 173, for Plate xiii, read Plate x a. 



213, for Trematospira, Subgroup Rhynchospira, read Genus Rhynchospira. See also Addenda, 

 p. 484. 



215, 216 and 217, for Trematospira globosa, T. formosa, T. deweyi and T. rectirostra, read 

 Rhynchospira globosa, R. formosa, R. deweyi and R. rectirostra. See Addenda, p. 484. 



257 : Pcntamerus j;a\e&tus, for author and synonymy, see Part ii, Explanation of plates; also 

 for P. pseudogaleatus and P. vcrneuli. 



259, for Plate xlvi, read Plate xlviii. 



343, 11th line from bottom, for chamber, reed outer chamber. 



350, IGth line from top, for Lepcrdita, read Leperditia. 



410*, for Eurypterus lacustris, var. robustus, read Eurypterus robustus. 



424, 23d line from top, for ventral, read dorsal. 



427, 4th line from top, for dorsal, read ventral. 



440, 13th and 14th lines from top, for dorsal, read ventral. 



445, 10th line from bottom, for dorsal, read ventral. 



445, 7th line from bottom, for corrections, see Explanation of plates. 



N. B. The incorrect or incomplete references to plates (arising chiefly from printinj; the book in advance of the 

 engraving), will be found corrected in Part ii, in the explanations of the plates accompanying that part of the 

 vnlome. 



