COEEIGETsTD A 
Page 13, line 15, after spatulnta, insert vanuxem. 
Page 33, line 4, before beds, insert fossiliferons. 
Page 36, line 7, for 1 and 2, read 1 a and 1 b. 
Page 36, line 9, for 3, 4 and 5, read 2 a-d , 3 a-e. 
Page 42, line 23. for Idas read eryna. 
Page 45. line 20, for vi read vn. 
Page 48, line 14, for Laveille read Leveille. 
Page 48, line 27, for vi read vii. 
Page 49, line 33, for 3 e read 4 e. 
Page 52, line 23, for vii read lxiii. 
Page 76, line 10, before species, insert other. 
Page 78, line 25, after median, insert line. 
Page 101, line 4, for 1 c read 1 e. 
Page 101, line 7, for 1 l read 1 i. 
Page 101, line 8, for 1 k, u, read 1 k, l. 
Page 101, line 10, for 15 read 13. 
Page 108, line 21, for textilis read junta. 
Page 109, line 32, dele this line. 
Page 111, line 10, for xix A. read xv. 
Page 111, line 11, for Strophodonta read Stropliomena. 
Page 112, line 9, for elmira read cayuta. 
Page 113, line 9, for 8 read 6. 
Page 116, line 7, for no species read one species. 
Page 136, lines 4 and 5, dele reference to Plate 22. 
Page 136, line 19, for konincki read koninckiana. 
Page 137, line 19, refer species to Plate xxii. 
Page 138, line 12, after forty insert (including bifurca- 
Page 143, line 1, for mnricatus read mnrtcata. 
Page 144, line 19, for (fig. 00) read (fig. 33). 
Page 156, line 1, refer species to Plate xxxii. 
Page 165, line 23, for Productiis? read Productus 
(JProductella) papulata (n. s.). 
Page 166, line 4, insert beneath, Productus hirsulus: 
hall, 10th Rep. St. Cab. p. 175. 1857- 
Page 167, line 24, for 1-9 read 18-27. 
Page 167, line 29, for 9 read 24. 
Page 171, line 15, for 19-23 read 1-9. 
Page 183, line 29, for or two, read one, two. 
Page 188, lines 1 and 3, for CviSTiEXA read Cyrtina. 
Page 189, line 2, for Spirifer read Spirifera. 
Page 196, line 12, for species read shells. 
Page 200, line 23, for 34 read 35. 
Page 201, line 3, for 34 read 35. 
Page 205, line 21, for xxx read xxxr 
Page 207, line 30, after of the, insert area. 
Page 218, line 21, for 33 read 34. 
Page 223, line 22, for S. arcta read S. arata. 
Page 225, line 17, dele sentence referring to casts. 
Page 229, line 5, for xxxvill read xxxvm *. 
Page 234, line 18, for xxxii read xxxill. 
Page 241, line 11, for greasly read greatly. 
Page 246, lines 10 and 17, for xli read xm. 
Page 246, line 12, for 15 read 17. 
Page 246, lines 18 and 33, for xlii read XLI. 
Page 250, line 2, for xxxii read xxxm. 
Page 251, line 13, for xxxii read xxxm. 
Page 251, line 15, for 32 read 31. 
Page 251, line 18, dele 2d comma, and insert variation. 
Page 253, line 32, for marylandica read cumberlandia. 
Page 262, line 27, for 5 a read 5. 
Page 270, line 3, for xvn read xliv. 
Page 271, lines 9 and 10, dele reference to dotted line. 
Page 279, line 33, for xiv read xlv. 
Page 287, line 9, for 10 read 8. 
Page 287, line 10, for 8 read 9. 
Page 287, line 11, for 9 read 10. 
Page 290, line 13, after h insert (see figure on Explanation 
of Plate.) 
Page 299, line 18, change reference of A. nasuta to Jour. 
Acad. Nat. Sci. Ph. vol. viii, p. 265. 1842. 
Page 305, line 33, for shade read shale. 
Page 329, line 2, for liii read Lll. 
Page 329, line 10, dele may—may. 
Page 343, line 2, for liv read liv A. 
Page 344, lines 2 and 25, for liv read LIV A. 
Page 346, line 2, for LV read liv a. 
Page 349, line 1, after stepliani add (n. s.). 
Page 357, line 1, after mysia add (n. s.). 
Page 361, line 2, for lvi read lvii. 
Page 364, line 16, for lvii read lvi. 
Page 373, line 37, dele P. obsolescens. 
Page 380, line 6, for lviii read lviii a. 
Page 384, line 28, for lix read lviii a. 
Page 385, line 7, for LX read lviii a. 
Page 388, line 5, dele without appendage. 
Page 397, line 1, for Cryptonella ? read Terebra- 
tula. 
Page 399, line 17, for lxi read lxi a. 
Page 401, line 2, for lxi read lxi a. 
Page-402, line 2, for lxi read lxi a. 
Page 403, line 10, for lxi read lxi a. 
Page 408, line 33, for lxii read lxi a. 
Page 412, line 3, after Plate add lxiii. 
