ERRATA. 
Page 17, second line of last paragraph, for calcareous, rend argillaceous. 
112, 14th line from top, for and, read with. 
123, 17th 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. 10). 
138, for Plate lxxxiv, read Plate lxxxv. 
139, 14th line from bottom, for three in series of five, read live 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 : Pentamerus galeatus, for author and synonymy, see Part ii, Explanation of plates; also 
for P. pseudogaleatus and P. verneuli. 
259, for Plate xlvi, read Plate xlviii. 
343, 11th line from bottom, for chamber, reed outer chamber. 
350, lGth line from top, for Leperdita, 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, sec Explanation of plates. 
N. B. The incorrect or incomplete references to plates (arising chiefly from printing the hook in advance of the 
engraving), will be found corrected in Part ii, in the explanations of the plates accompanying that part of the 
volume. 
