XXI 



despotic, however, and will not allow the identity of two forms 

 found in two widely separated horizons even when the closest 

 scrutiny can detect no difference. Oddly enough the bitterest op- 

 ponent of evolution, Lewis Agassiz, carried this prejudice to its 

 extreme, by refusing to regard two fossils as of the same species 

 if they were found even in two subdivisions of the same forma- 

 tion. 



207, 16. Diplograi>tus ? simplex. Probably some other genus. (G. F. M. ) 



208, 5. Read Utica formation. Til a. 



208, 32. For X— 6, read 6—10. (E. W. C.) 



209, 4. Read "not Orbicula lamellosa.''' (R. P. W.) 

 209, 24. Read 1885. 



209, 35. For X-10, 16, 20, read 6-21. (E. W. C.) 



210, 1. Disci na grandis, a synonym of Discina ampla, to which the 



whole paragraph should be transferred. (E. W. C.) 

 210, 14. Hall's Report on the 4th District of N. Y. 1843, is always meant 



when "Hall" stands thus alone. So of Vanuxem's Report on 



the Third District of N. Y. 1842, when "Vanuxem" stands alone. 



"Rogers" standing alone refers to his Geol. Pa. 1858. 

 210, 24. For 25 read 23. (E. W. C.) 

 210, 37. Erase 20. (E. W. C.) 



212, 28. Insert Dyscritus vetustus, Scudder. A cockroach from St. John, 



N. B. Geol. Mag. Lond. Vol. 5, 1868, p. 172, 176. (See Dawson's 

 figures of these insects in Geol. Mag. Vol. 4, September, 1867, p- 



385.) Devonian strata. VITI? IX? 



Eatonia medialis. The first two figures here given are of Lepto- 

 ccelia flabellites, Conrad ; the third figure is of Leptoeoelia fiin- 

 briata, Hall. (R. P. W.) 



213, 19. Rogers' fig. 640 is an Athyris. (R. P. W.) 



213, 38. Erase 6. (E. W. C.) 



214, 6. Reverse the figure ; the creature is now shown lying on its back. 



(J. H.) 



214, 10. Read 655, fig. 863. (R. P. W.) 



214, 18. Read spines. 



214, after 26 insert Edestes davisi found in Australia; Edestes gigan- 

 teus, and Edestes lieinrichi, both found in Illinois ; Edestes 

 minor, found in Illinois. (E. W. C) 



214, 27. This is not Edestes vorax, but Edestes minor, Newb. See An- 

 nals of N. Y. Acad. Sc. Vol. 4, 1888. (J. S. N.) 



214, 40. For iSubcarboni/ei^ous, read Coal measures of Arkansas. The 



genus Edestes in America has up to this date been found no- 

 where but in the Mississippi Valley coal fields. (E. W. 0.) 



215, 1. Read Aspiiiwallensis. (R. P. W.) 



215, 11. Erase (Black Foss.) ; the two limestones are different. (J. J. S.) 



215, 36 to 40. Erase the whole, as out of place, and better expressed in its 



proper place on page 330 below. 



216, 7. For Edmondia read Cypricardites. (R. P. W.) 



216, under 14 insert Eileticus anthracinus, Scudder. Mem. Boston S. 



N. H. Vol. 3, p. 179, pi. 13, fig. 56, from Mazon creek, 111., (Joal 

 7neasures, XIII. — See Appendix. 

 216,37. For throat read thoracic, (chest.) 



217, 2. Insert "Hall," belore Rogers. 



