Corrigenda. 



In page 14, line 18, for Emmerich, " 1845," read " 1839." 

 „ „ 13, for "ost," read "lost." 



„ 37, at bottom, add the following synonym : 



" Chasmops Odini, Hoffmann. Trilob. Russlands Verhandl. Kaiserl. Miner. Gesellsch 



zu St. Petersburg, 1858, t. iv, fig. 7. 

 „ 39, for "fig. 7," read "fig. 9." 

 ., 44, line 4, for "VII," read " VI." 

 ., .i9, ,, 3, add synonym, "Salter, in Decades of Geol. Survey, No. 2, Article P. caudatus, 



p. 8, (see line 16)." 

 ,, 64, line 13, omit fig. 10. 



