II ERRATA. 



PAGE. LINK. 



49 7 From bottom, read 1841. 



50 7 Prom bottom, read 1858. 

 53 J2 Read tenuicosta. 



55 15 Read Hall & Whitlield. 



58 18 Add 1859. 



59 1 Read Hall & Whitiield. 



60 1 Read Hall & Whitneld. 

 60 3 Read p. 185, 1872. 



60 4 Read 4-7. 



60 25 Read Hall & Whitlield. 



60 4 From bottom, read Ibid Idem. 



60 2 From bottom, add 1852. 



68 Make line 13, 14 instead. 



71 21 Read p. 168. 



71 22 Read Atrypa (OrtMs) quadricostata. 



75 3 Read pi. 54. 



83 3 From bottom, read 1847. 



83 5 From bottom, read Ryiwlwnella capax, Conrad., and add 



below; Atrypa capax, Conrad. Jour. Phil. Acad. Sci., 

 vol. 8, p. 264, 1842. Rhynclionella increbescens, Hall. 

 12th Report State Cab. Nat. Hist., p. 66, 1859. 13th 

 Report State Cab. Nat. Hist., p. 66, 1861. Rhynclio- 

 nella capax, Billings. Pal. Foss. Can., vol. 1, p. 142, 

 1862. RhyncJionella capax, Meek. Pal. Ohio, vol. 1, 

 p. 123, 1873. 



84 25 Read 1876. 



85 3 Read 1876. 



85 Under Ambocoelia add; Ambocoelia, Hall. 13th Rep. N. 



Y. State Cab. Nat, Hist., p. 71, 1860. 

 88 Add between line 8 and 9 from bottom, Atrypa spinosa 



vel aspera. 



93 11 From bottom, read trapezoidalis. 



93 10 From bottom, read trapezoidalis. 



103 10 From bottom, read pp. 25, 26. 



104 7 From bottom, add p. 221 . 



104 4 From bottom, read pp. 301, 302. 



105 13 From bottom, add 1867. 



108 10 (Note. This reference is evidently to the extra or author's 



edition of the paper published in the 1 Oth Annual Report, 

 with new pagination.) 



