ERRATA. 



Volume I. 



Page 46. Cryptozoon proliferum, add to localities : Upper Cambric of New 

 York and Pennsylvania. 



Page 53. 12 lines from bottom, for XXXIX. Alveolites, read XL. Alveo- 

 lites. 



Page 77, no. 64. for C. tenneseenensis read C. tennesseensis. 



Page 211. for Protorthis {Billings ella) billingsi read: P. billingsi (Billing- 

 sella billingsi). 



Page 231. Derbya is synonym, not a subgenus. 



Page 231. for Orthotetes read Orthothetes, and add to horizon Mississippic. 



Page 276. Barrandella is a synonym of Clorinda, not subgenus. 



Page 571. species 585, dele (Fig. 794). 



Page 629. for Euomphalopteris read Euomphalopterus. 



Page 648, species 141-143, for P. read T. 



Page 658. Fig. 906, c, e, for Eccyliopteris read Eccyliopterus. 



Page 668. Fig. 924 for Polenmita read Poleumita. 



Volume II. 

 Page 113. for Cyrtohoanites read Cyrtochoanites. 

 Page 128. Fig. 1376, for after Hyatt read after Hall. 

 Page 133. for Climenida read Clymenida. 

 Page 263. for Mesonaces read Mesonacis. 



