XVI 



11:5, over 1, insert, Conularia niagareiisis. Plall, Pal. N. Y. Vol. 2. See 



Conularia quadrisulcata helow. (J. W. D. ) 

 L45, 22. For C. quadrisulcata, read C. niagarensis. (C quadrisulcata.) 



145, 26. For Miller, read Sowerby. (E. W. C.) 



146, 7. Read Fig. 3. 



146, 23. Read siphuncle. — How can a Conularia have a sipliuncle ? (G. F. 

 M.) 



146, 31. Add dung of reptiles, &c. (J. S. N.) 



147, 21. For corallines, read crinoids. 



147, 33—36. Erase from "small" to "Mill Cr." These are small branching 

 bryozoa. (E. W. C.) 



147, 38. For corallines, read corals. (E. W. C.) 



148, 10. Read Cystiphyllmn ; and 11, corals. 



148, 23. Coral, " Probably Inocaulis plumuliiia. Hall. Pal. N. Y., Vol. 2. 



(J. W. D.) 



149, 1. Read flexuosiiin, rugulosum, spicatum, (E. W. C. ) 

 149, 2. YoT Sigillarim., read Cordaitem. (L. L.) 



149, 10. Read congruens. 



149, 36. A new Cordaites from the Devonian rocks at Meshoppen, Wyom- 



ing Co., Pa. See Dicto-cordaites in the Appendix. 



150, 1. Read Cardloearpus. 



150, 7. Add : "also very abundant in Nova Scotia." (J. W. D. ) 



150, 22. Read 86. 



151, 1. Read lacoei. 



151, 2. Insert Ct>rdaites gracilis. Recently reported by I. C. White from 

 the Tipton Run Coal beds in Blair Co., Pa., hitherto accounted to 

 be in the Pocono No. X formation. (MS. letter Feb. 27, 1889.) 



151, 5. ^Re'Mifolialatiis. 



151, 13. C principalis is very abundant in the Perrao-carboniferous of Nova 

 Scotia tfe Prince Edwards Island. (J. W. D.) 



151, 15. There is no such species as C reflexa. (L. L.) 



151, 37. Read drtisia. 



151, 38. Read DadoxyJon. 



152, 25. Insert Cordaites simplex. See note under C. principalis, above. 

 152,31 — 33. Erroneous description. There are no discs ; only undulations 



of the surface ; the tube is open inside. (R. P. W.) 



153, 2. Read Rogers'. 



153, 22. This Crania corrugata is probably nothing but the under surface 

 of Lichenalia conceiitrica, a br3'ozoon. (R. P. W.) — Probably 

 the base of a coral of the Lichenalian type. See Pal. N. Y. Vol. 

 2, plate 40 E, fig. 5, 6. (J. H.) 



153, 39, 40. Erase 162, 163, 164; and (1); also the 4 on page 154, line 1. (E. 



W. C.) 



154, 12. For Crania prima read Lingulepis pinniformis, the smaller 



(dorsal) valves of which are shown in Owen's figure. (R. P. W.) 

 154, 24. N. H. Winchell does not consider the >St. Croix sandstone as Pots- 

 dam. See his Minnesota Geological Reports. (A. W.) 



154, 34. Crematopteris pennsylvanica, Lesq. is probably a poorly pre- 



served Cordaianthus. (R. D. L. ) 



155, 29. Read Upjjer Cambrian. (G. F. M.) 

 155, 31. Read Upper Cambrian. (C. D. W".) 



