XXVI.—P. 67, lines 4 and 5 from top, for ‹†Ř: 23K :: 4Si : 1H,' read ́ZŘ3 : 2†¤::
4Ŝi: 3Ė,' and dele the index 3 after (†Ř3+ZË).—P. 108, 1. 7 from bottom, for ‘J.
W. BILL,' read 'J. H. BILL.'-P. 158, 1. 1 from top, for '95,' read ‘96.'—P. 169, lines
12 and 14 from bottom, for 'v,' read 'V.-P. 170, 1. 3 from bottom, after 'as much
as,' insert 'one-fourth of.'-P. 236, 1. 17 from top, for '80,' read ‘90.'-P. 298, 1. 19
from bottom, for 'inside,' read 'irised.-P. 305, in the title of Hayes's article, dele
'with a map.-P. 331, 1. 5 from bottom, after the beak of the,' insert 'smaller valve
in the.-P. 332, 1. 19 from top, after 'identical,' insert 'with foreign forms.'—P. 333,
1. 10 from top, after 'Cretaceous,' insert 'and perhaps Tertiary.'

XXVII.-P. 243, 1. 1 from bottom, after 'Delphi Slate,' insert 'or Black Lingula
shale, equivalent of the Genesee Slate or Marcellus shale of New York.'

XXVIII.-P. 236, 1. 1 from top, for 'lightly,' read 'slightly;' 1. 7, after 'other,' in-
sert 'side is a.'-P. 240, 1. 1 from top, after 'Actinocrinus,' insert 'grandis;' 1. 16 from
top, for 'obscure,' read 'obscurely.-P. 241, 1. 2 from bottom, for 'oval,' 'read'oral.'
P. 244, 1. 14 from top, for 'armbones,' read 'umbones;' 1. 6 from bottom, for 'cy-
clostomus,' read 'Cyclostomus.'-P. 248, 1. 23 from top, for 'p. c.,' read 'oz.-P. 252,
1. 28 from top, for ',' read .-P. 291, 1. 1 from bottom, for 'ENGLEMANN,' read
‘ENGELMANN.-P. 353, 1. 14 from bottom, for '3-8924+121·80,' read '3·8924× 121·80;'
1. 10 from bottom, for '4.6440+121 80,' read '4.6440×121·80.-P. 356, 1. 20 from bot-
tom, after cultivation,' insert a period, and for 'where,' read 'Where;' 1. 19 from
bottom, dele 'then.'-P. 357, 1. 10 from top, for sand,' read 'mud.'-P. 403, (in some
copies,) 1. 8 from bottom, for ANDREAS, read 'ANDRAS.'

XXIX.—P. 272, 1. 9 from bottom, for 'HENTZ,' read 'HEINTZ.-P. 295, 1. 2 from
bottom, for Carten,' read' Garten.'-P. 452, 1. 11 from bottom, and p. 453, 1. 14 from
top, for 'LEIBER,' read 'LIEBER.'-P. 454, 1. 13 from top, (in some copies,) for
'DAGURIN,' read "DAGUIN.'

XXX.—P. 162, 1. 16 from bottom, for 'many,' read 'some.'-P. 167, 1. 23 from top,
for 'best,' read 'test.'-P. 174, 1. 18 from top, for 'point,' read' part.

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