262, 



9. 





34. 





35. 



263, 



27. 



264, 



6. 





10. 





17. 





18. 





20. 



265, 



2. 





4. 



266, 



1. 





3. 





8. 





12. 





24. 





29. 



267, 



10. 



268, 



3. 



269, 







6. 





16. 



XXVI 



Erase 36 ; and on line 10 erase D, also 9. 

 Read hannibalense. 

 Read Shumard. 

 Read {Peyitremites melo.) 

 Now Diplo^raptus dentatus. (J. W. D. ) 

 Read graptolites. 



Now Didymograptas divaricatus. (J. W. D.) 

 Read Utica shale, Ilia. (R. P. W. ) 

 Same correction. 

 Same correction. 



Now Dictiograptus logani. (J. W. D.) 

 Read Levis. 



Insert Hall before Walcott. (R. P. W.) 

 For LorainSj etc., read Utica, II a. (R. P. W.) 

 Same correction. 

 Read Graptolithus. 

 Read Retiograptus. 

 Read burliiigtonense. 

 For Meyer, read C. S. White. 

 After 3 insert Gyroceras expansiim, Sseman. See Nautilus bucci- 



num, Hall. VIII c. 

 Read Vol. 1. 



Read Halonia tortuosa, (and erase H. tuberculata) which is a 

 good name. Lesq. Coal Flora., p. 413, pi. 61, fig. 1, 3. (R. D. L.) 

 40. ''Lepidodendroid trees allied to Lepidophloios, and mostly decorti- 

 cated. (J. W. D.) 

 271, 6. For escliaroides, read cateuulatus, the same as on page 270. (J. 

 J. S. &R. P. W.) 

 Read Little Glace Bay. 

 Read (coleopterids. ) 

 Read longipeniie. (E. W. C.) 

 For : under the, read, near the base of. 

 For 286, read 41, 157.— For XI read XII. Add. Proc. Am. Acad. 



Vol. 20, 1888, p. 172. 

 Read Pty chop aria. 



XfiQv Niagai'a 2u&d Clinton. (E. W. C.) 

 Read Rafinesque. 

 Read Heliophyllum. 

 Read Aulopora. 



Insert Hemeristia occidentalis. See Appendix. 

 For Heinipronites read Streptorhynchus. (R. P. W.) 

 Erase : and the same. (J. J. S.) 



Read XI. " No. X has no observed fossils in Fayette and West- 

 moreland counties, except near the head of Redstone creek, and 

 there they sxejisft remains^ very indefinite." (J. J. S.) 

 There is no Hemipronites crenistria. All unite in considering it 



IhQ ij^Q of Streptorhynchus. (R. P. W.) 

 Erase the comma after Heterocrinus. 

 Insert here (from page 298) mppurites, &c. 

 Read obliquus. 



Holoptychius americanus, Leidy, is probably distinct from H. 

 nobillissimus, the scales being only half as large. (J. S. N.) 





22. 





25. 



272, 



6. 





7. 





8. 





20. 



273, 



10. 



275, 



14. 



281, 



29. 





33. 





83. 



282, 



1. 





31. 





33. 



282, 



39. 



283, 



4. 





19. 





32. 



284, 



29. 



