286, 



8. 



287, 



7. 





9. 





34. 



288, 



8. 



288, 



25. 



289, 



8. 





13. 



291, 



4. 





7. 





8. 





34. 





36. 



291, 



38. 



292, 



3. 





5. 



293, 



11. 





12. 





16. 





23. 



294, 



24. 



xxvu 



Holoptychius is closely allied to Saiiripteris but not certainly 



identical. (J. S. N.) 

 Read Recherches. 

 Read Scottish. 

 Erase 3, 7, 13. (E. W. C.) 

 Read Silurian System founded on Geol., Researches, &c., London, 



1839, pi. 7, figs. 1 «, 1 b, (A. W. V. ) 

 Erase 161, 13. (E. W. C.) 



Insert HomothLetus fossilis, Scudder. See Appendix, 

 Read skull. 

 Read Hylo7iomus. 

 Read Fundy. 

 Read iSigillariiv) . 

 Read hildrethi. 

 Read Kanawha. 

 Rhacophyllum expaiisum, found at Olyphant, Lackawanna Co.j 



Pa. Lesq. Coal Flora. XTII. (R. D. L.) 

 Read Sphenopteris liildrethi, Lesq. Coal Flora, p. 283. (R. I). L.) 

 Read Kanawha. 

 ReadX. G. (G. F. M.) 

 Read acadicus. 



Read Lower Qamhrian^ L. C (G. F. M. ) 

 Read aealeata. 

 Read carTbonarius. 



295, 20 and 22. Read Lower Cambrian^ L. C. 

 27. Read Hall and Whitfield. (R. P. W.) 



296, 6 and 8. Resid Lower Gambi^ian, L. C. (G. F. M.) 

 22. Read U. S. G. S. 



297, 18 and 21. Read Lower Cambrian. L. O. (G. F. M.) 



298, 3. Read Hippurites and transfer to page 283. 



298, The long» spine is that Machcer acanthus sulcatus, Newb., the 



shorter ones, of MachcEr acanthus 7najor, Newb. Pal. Ohio, Vol. 

 1, p. 304, pi. 25, fig. 2, (J. S. N.) 



299, 5. Read cheek. 



300, 24. Read (J. W. Dawson.) 

 39. Read contributions. 



301, 3. ReadWalcott. 



301, 10. Isotelus canalis, should be Asaphus canalis. See Whitfield's 



excellent description of it in Ann. Mus. Nat. Hist., N. Y., Vols. 

 1, 2, especially plates 11 and 12. (A. W. V.) 

 11. For Trenton & ILudson river, read Birdseye and below; for J. 

 canalis has not been found in New York State above the Birds- 

 eye limestone ; never yet in Trenton, nor in Hudson river. (R. 

 P. W.) 



302, 1. For Isotelus gigas read Asaphus platycephalus, Stokes. ( A. W. V. ) 

 302, 33. Insert : Often found in the Hudson river (Cincinnati) formation in 



Ohio. (E. W. C.) 

 302, 40. Read acicularis. 

 305, 1. Leaia triearinata has had here given to it, by mistake, the figures 



which belong to the trilobite Phillipsia scltula. The correct 



figures will be given in the Ap>%)endix. 



