574, 11, 12. Claypole reads quadrispinosa^ and P. cuneata^ — 18. Insert 

 << aprotozoon."— 19. The doubt is explained thus: <'This is a distorted 

 example. The shell is oval in outline, and the apex at the posterior third ; 

 its relation to Acmcea is therefore doubtful." (Matt.) —23. Insert '* Divis- 

 ion 1." (Matt.) 



578,9. Read "ventral." — 24. Read Matihevia. 



580, 1. Insert " Palseoctonus appalacManus, Cope. Proc. Amer. Phil. 

 Soc. Philada. 1877, page 182. A gigantic carnlverous Dinosaur, bones of 

 which were found in the red sandstone of York Co., Pa. Trias, — 8. 

 Erase "-8." P. harrisi was not found in L, Held, shales, at Montebello, or 

 elsewhere ; but in the King\t Mill series of the Chemung-Catskill transitiori 

 group (which Stevenson, however, considers pure Chemung.) In printing 

 Cat 000, S. 49 (L. Held.) and S. 50 (Chemung-Oattskill) were confused- 

 (E. W. C.) 



581, 9. Erase 23. —11, 12. Erase " opposite Newport" etc. to " Chemung,^^ 

 (E. W. C.) —27. Read Barnett's mill. 



582, 23, 24. Erase 33, and 24, 26. (E. W. C.) 



588, 29. Read Comp'smill. — 34. For Oris kany? vesid Hamilton, VIII c 

 (E. W. C.) 



584, 27. Insert — J? — XI, (Matthew. ) 



586. P. heverlyensis, Billings. (J. W. D.) 



587. Claypole would read P. gracile ; P. irregulare ; P. tubulare (p. 588. ) 

 — Read Palseophycus mllleri. It is a good species. P. gracilis (gracile) 

 may be a variety of it. Coal Flora, p. 10, pi. A, fig. 8. (Lacoe.) — P. tubu- 

 lar is (tubulare) " probably worm burrows " (J. F. James.) — P. irregula- 

 ris (irregulare) fig. on p. 589, **most likely of inorganic origin." (J. F. J). 



589, 31. Read Van Cleve. 



590,1. Insert Palseosaurus fraserianus, Cope. Proc. A. P. S. Philada., 

 1877, p. 232. A probable Parasuchian crocodile, from York Co., Pa. Trias, 



491,13. "A species not to be distinguished from this (P. maculata) oc- 

 curs in the Cincinnati group (Hudson river, III 5), of Iowa. (Jos. F. 

 James. ) 



595, 6. Read Platynotus boltoni, and transfer it to p. 691. — 15. Read 

 Paola. Also on 596, 2. (CoUett.) But S. A. Miller reads it as it stands. 



596, 597. G. K. Greene prefers Upper Helderburg to Corniferous lime- 

 stone; and on line 14, for (Corniferous) would read (Middle Devonian.) 

 This may do in the west, but would be almost absurd in Pennsylvania. 



597, 7. See page 215, Vol. 1. (Matthew.) 



598, 16. There are no Paradoxides in the fauna of Mt. Stevens. —26. For 

 "Portland?" read "Band ^ of Division 1, St. John." Add: "A small 

 species distinguished from others which occur with it by its thick granu- 

 lated test." (Matthew.) 



599, 15. For 2, read 1 a. Compare with tail of P. rugulosus on p. 602. 

 (Matt.) 



600, P. Kjerulfi, "as described by Gerard Holm is a form of Mesonacis^ 

 Walcott. (Matthew.) 



601,9. Insert "Div. 1 c. Portland (now St. John)." (Matthew, who 



objects to Walcott's Middle Cambrian horizon of Paradoxides, on this and 



next page.) 

 602, 19. Read Paromylacris rotunda, an d transfer it to-p. 603. (Scudder. ) 

 603,7. Patella, Linn, is not a Palseozoic genus (S. A. M.) for Linnseus 



substitute White. (Claypole.) — Line X. P. nyops is from the Trias of N, 



Carolina. (Cope.) 



