DATES OF 
Pleurotoma conoides, 
p. 51, tab. 
“ subequalis, 
It ll a 
“ elaborata, 
“ 52, “ 
“ depygis, 
« a it 
“ acutirostra, 
a u n 
“ gemmata, 
u >i u 
“ callifera, 
a a _ 
Fusus trabeatus, 
“ 53, “ 
“ inauratus, 
ii ii ii 
“ papillatus, 
ii it ii 
“ limulus, 
it a a 
“ perlatus, 
“ 54, “ 
“ thoracicus, 
u u u 
“ protextus, 
u u u 
“ raphanoides, 
u u u 
“ irrasus, 
66 66 66 
“ bellus, 
“ 56, “ 
“ thalloides, 
66 66 66 
“ salebrosus, 
66 66 66 
Ranella Maclurei, 
“ 55, “ 
CONRAD. 227 
17, fig. 17. 
— 
— 
ii ii 
18. 
— 
— 
a ii 
19. 
Orig. p. 46. 
ii ii 
20. 
. ii 
“ 46. 
a a 
21. 
— 
— 
u u 
22. 
— 
— 
18, “ 
1. 
Orig. p. 29. 
66 66 
2. 
66 
“ 29. 
66 6 6 
3. 
66 
“ 29. 
66 66 
4. 
66 
“ 43. 
66 66 
5. 
66 
“ 45. 
66 66 
6. 
66 
o 
CO 
66 66 
7. 
66 
“ 43. 
66 66 
8. 
J. Ac. N. Sci. vii. 
66 66 
10. 
66 
ii ii ii 
66 66 
11. 
Orig. p. 43. 
66 66 
12. 
ii 
“ 43. 
66 66 
13. 
J. Ac. N. Sci. vii. 
66 66 
9. 
Name and fig. only. 
After page 56 follow plates 15-18. The back leaf of the 
cover is blank. Nothing in continuation was ever pub¬ 
lished. 
This paper is extremely scarce also, though not so scarce 
as the Say and Morton number. Prof.E. A. Smith, Mr. T. 
H. Aldrich, Harvard College, and the writer possess copies 
of it. It was followed by a second edition at some time be¬ 
tween 1842 and 1845, which is for the most part identical, 
if not, indeed, partly made up of sheets printed for the first 
issue. In the introduction there are no essential changes, 
but on page 36 we find under the caption, “ The following 
terms are adopted for the American Tertiary formations,” a 
new set of terms, “Upper Tertiary or Newer Pliocene,” 
“ Medial Tertiary or Newer Pliocene,” and “ Lower Tertiary 
or Eocene,” Miocene being omitted. 
Then follows this note about matters of priority, the ob¬ 
jectionable references to Mr. Lea having been expunged; 
the words in brackets are added for clearness: 
“It is necessary to observe that all the species of Eocene 
fossils described in the following pages, unless where credit 
