11 



401, 1. Read Mesonacis ; and 399. 



402. Erase the first two lines ; they belong to p. 387. 



403,25. For always read usually. Ei-ase ''never seen, <fec." For Cold- 

 brook read St. John. " This species has tivo segments in the thorax like 

 an Agnosias " (Matthew.) He w^ould also make it (Microdiscus dawsoni) 

 Lower Cambrian^ (p. 404 ;) and also M. punctatus on p. 405. 



406. Modiola angusta. ''There is some great mistake here. Hall has 

 the specimen collected by me within a few feet of the very top of the Cats- 

 kilV (J. J. S.) 



410. M. suhalatus. Figures upside down. 



412. Read M. alaia. Hall. 



416. Read Menocephalas salteri, and transfer it to p. 390. 



433, 1. Read page 207. 



435,9, 10. Erase Mazon creek and nodules. — Line next bottom, read, 

 Vol. 3, 1884, p. 301, pi. 27, fig. 8 (Lacoe.) 



436,4. Insert: Type in Dr. 8cudder^s collection ; also specimens in the 

 Lacoe, &c. (Lacoe.) 



Errata, page i. Re^d Sir John William Dawson. — Captain A. W. Vogdes. 



ii, 7, 32. Read Adiphlehia lacoana * * -^ a hexapod neuropteroid. — 

 A. singulariSf ditto. — 1885. — 8, 14. Read Brevifrontes. 



iii, ii, 2. Read Dec. 27, 1888. 



V, 29, 7. A. trilobitusj was found at Fayetteville, Ark., in Subconglom- 

 erate shales, XI. — A. robusta, a hexapod newropteroid insect. 



vi, 31, 6. Read ArcliegogryUus ^ * * a hexapod (cricket.) 



vii, line 4. Read Joggins coal measures N. S. 



viii, 52, 33. Read trilineatus. 



xiii, 125, after 6. Read Chlsenius. — Read Cheliphlebia. 



xiv, 135, 40. Read Cochliodus. 



XV, 141, 32. Transpose lines 20 and 21, so as to make line 21 (" same re- 

 mark," etc.) follow line 20 ; and read "nearly as large as this drawing." — 

 142, 1. " Walcott's and Rominger^s observations on the Cambrian faunas 

 of the Rocky Mountain region show a closer relation between the Middle 

 and Upper Cambrian faunas than has hitberto been known. The Cam- 

 brian system is therefore now best divided, as proposed by Dr. Hicks, into 

 two grand sections. Lower and Upper ; this Upper including what is called 

 J/tdd^e in this note." (G.F.Matthew.) 



xvi, 149, 36. Read Dictyo-cordaites. 



xviii, 187, 21. Read Odontocliila, Laporte, Coleopt. 1834 (Horn.) 



xix, 189,26. " No /Si^ttrian, wo Devonian in Park Range, Colorado; but 

 Carboniferous absolutely conformable to Cambrian.^^ (J. J. S.). — 192, 1. 

 Read Danseites. — 199, after 37. Read Dictyo. 



XX, 201,40; 202,1. Both are neuropterous insects. (Scud.) xxi, 212,28. 

 The same. — Line 4, read Louis. — Line 49, read figs. 5, 6. 



xxii, 220, 12. Scudder also objects ; saying that Scorpion, King-crab, or 

 horse shoe, would be better than lobster. — Line 36. Read Spirocyathias. 



xxiii. E. For Gate read Mammoth or E vein. (Lacoe.) — E. ovalis, b. 

 neuropteroid insect. — 233,13. Read Myriapod. Also p. 177, pi. 12, f. 20. 



xxiv, line-i. Read 233,14. Line 2, read, f. A, B. Figs. C, D, are Scud- 

 der's E. granosa. 



XXV, 253,33. Read fig. 11.-253,40. Read Vol. 3.-254,5. Read Gera- 

 phrynus. — 261,1. Insert retiforme, Hall. 

 xxvi, 266, 8. Read III a. — 272, 8, read 1884. 



