TABLE OF SPECIES. 
325 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
6( 
15 
16 
1 
1 
2 
3 
GENERA AND SPECIES. 
9 Atrypa bisulcata, Emmons . 
10 — deflecta, Hall., 
11 — recurvirostra, “ 
12 — exigua, “ 
13 — inodesta, Say . 
14 — circulus, Hall.. 
15 — ■ ambigua, “ 
16 — hemiplicata, “ 
17 — sp. indet . 
18 — subtrigonalis, Hall 
19 — increbescens,* “ 
20 — dentata, “ 
21 — sordida, “ 
ACEPHALA. 
1 Ambonycliia mytiloides, Hall 
2 — bellastriata, “ 
3 — orbicularis, Conrad . 
4 — amygdilina, Hall .... 
5 — undata, Conrad . 
6 — obtusa, Hall . 
7 —? sp. indet . 
8 — radiata. Hall . 
9 — carinata, Ooldfuss ... 
1 Avicula trentonensis, Conrad . 
2 — elliptica, Hall . 
3 — insueta, Conrad . 
4 — demissa, “ . 
5 —■ ? desquamata, Hall .... 
1 Modiolopsis mytiloides, Hall.. 
2 — parallela, Conrad.... 
3 — l'aba, “ .... 
4 — 
nasutus, “ .... 
— arcuatus, Hall.... 
— subspatulatus, “ 
— latus, “ 
— carinatus, “ 
— aviculoides, “ 
— trentonensis, Conrad 
— modiolaris, “ 
— truncatus, Hall . 
— curta, Conrad ..... 
— sp. indet . 
— terminals. Hall . 
— anodontoides, Conrad 
— ? nuculif'ormis, Hall ... 
Modiola? obtusa, “ 
Tellinomya nasuta, Hall. 
— sanguinolaroidea, “ 
— gibbosa, “ 
Plate and figure. 
Page. 
| Potsdam sandstone. 
Oalciferous sandstone. 
Chazy limestone. 
birdseye limestone. 
I Piack-nver limestone. 
| Trenton limestone. | 
| Utica slate. 
X 
c 
D- 
U) 
o 
=3 
G 
d 
139 
4- 
140 
+ 
xxxiii, 5 a - d 
140 
. • 
+ 
.. 
.. 
1 41 
141 
_L 
+ 
+ 
1 42 
4- 
1 43 
144 
_L 
145 
r 
i 
145 
T 
I 
( xxxiii, 13 a - y 
146 
1 
+ 
l lxxix, 6 
289 
• • 
•* 
+ 
+ 
xxxiii, 14 a - c 
148 
+ 
• • 
xxxiii, 16 
148 
+ 
xxxiii*, 2 
315 
.. 
+ 
xxxvi, 4 a - c 
163 
+ 
xxxvi, 5 a - d 
164 
• • 
+ 
xxxvi, 6 a - c 
165 
+ 
xxxvi, 7 a, b 
165 
• • 
+ 
xxxvi, 8 a, b 
167 
+ 
xxxvi, 9 a, b 
167 
+ 
lxxx, 4 a - m 
292 
• • 
+ 
lxxx, 5 a, b 
294 
•• 
+ 
xxxvi, 2 a - d 
161 
+ 
xxxvi, 3 
162 
. . 
+ 
.. 
lxxx, 1 a, b 
291 
.. 
+ 
lxxx, 2 a, b 
292 
.. 
+ 
lxxx, 3 a, b 
292 
.. 
. *- 
+ 
xxxv, 4 a, b 
157 
• • 
+ 
.. 
xxxv, 5 
158 
+ 
( xxxv, 6 a - d 
158 
‘. 
+ 
• • 
\ lxxxii, 4 
298 
.. 
+ 
(xxxv, 7 
159 
.. 
+ 
.. 
\ lxxxi, 2 
296 
.. 
+ 
xxxv, 8 
159 
+ 
.. 
xxxv, 9 a, b 
159 
+ 
xxxv, 10 a, b 
160 
+ 
xxxv, 11 a - c 
160 
+ 
.. 
xxxvi, 1 a, 6 
161 
+ 
xxxiv, 10 
161 
.. 
+ 
• • 
lxxxi, 1 ; lxxxii, 1 
294 
.. 
+ 
lxxxi, 3 a, 6 
296 
.. 
+ 
lxxxi, 4 ; lxxxii, 2 
297 
+ 
( lxxxi, 5 a, b 
297 } 
? 
4- 
\ xxxiii*, 5 
318 5 
lxxxii, 3 a - c 
298 
• • 
. . 
+ 
lxxxii, 5 a, b 
293 
. . 
+ 
X, 1 
40 
+ 
xxxiv, 3 a - c 
152 
+ 
xxxiv, 4 a, b 
152 
•• 
+ 
• • 
xxxiv, 5 a, b 
153 
•• 
+ 
Rocks & Groups. 
Compare A. capax, Conrad, Jour. Acad. Nat. Sciences, Vol. viii, pag. 264, pi. 14, fig. 21. 
41-2 
