TABLE OF SPECIES, 
329 
GENERA AND SPECIES. 
Conularia trentonensis, Hall 
— granulata, “ 
— papillata, “ 
— gracilis, “ 
Theca triangularis, “ 
CRUSTACEA. 
Illaenus arcturus, “ . 
— crassicauda ? Waliltnberg 
— crassicauda, “ . 
— trentonensis, Emmons.... 
— latidorsata, Hall . 
Thaleops (Illaenus) ovatus, Conrad 
Asaphus ? obtusus, Hall ... . 
— marginalis, “ .... 
— ? extans, “ .... 
— ? nodostriatus, “ .... 
— ? latimarginata, “ .... 
Isotelus canalis, Conrad . 
— gigas ? Dekay . 
gigas, 
Hall 
Ogygia? vetusta, 
Acidaspis trentonensis, “ 
— spiniger, “ ... 
Platynotus trentonensis, Conrad .. 
Ceraurus ? sp. indet . 
— pleurexanthemus. Green. 
— vigilans, Hall ... 
— pustulosus, “ ... 
Calymene multicosta, “ ... 
— beckii, Green 
— senaria, Conrad . 
— (sp. indet.) . 
Phacops callicephalus. Hall . 
— ? laticaudus, “ 
Trinucleus concentricus, Eaton 
3 
4 
1 
2 
1 
1 Olenus asaphoides, Emmons .. 
2 — undulostriatus, Hall. 
1 Agnostus lobatus, “ 
1 Cytherina (sp. indet.) . 
Plate and figure. 
Page. 
I 
' 
lix, 4 a - f 
222 . 
lix, 5 a, b 
223 
lix, 6 a, b 
223 . 
lix, 1 a, b 
224 
lxxxvii, 1 a - d 
313 . 
iv (bis), 12 
23 • 
iv (bis), 13 
24 
lx, 4 a - d 
220 
lx, 5 
230 
lx, 6 a, b 
230 
lxvii, 6 a - c 
259 
iv (bis), 14 
24 
iv (bis), 15 
24 
lx, 2 , 2 a 
lxi, 1 a, b 
lxvi, 4 a, b 
iv (bis), 17, 18, 19 
228 
O/f Q 
253 
25 
iv (bis), 16 
25 
C lx, 7 ; lxi, 3, 4 ) 
< lxii, 1 , 2 ; lxiii ) 
231 ? 
( lxvi, 5 
lx, 1 
lxiv, 4 a -/ 
254 ) 
997 
240 
lxiv, 5 
241 
lxiv, 1 a - e 
235 
iv (bis), 20 
25 
C lxv, 1 a - m ) 
( lxvi, 1 a - h ) 
242 
. lxv, 2 a - h 
245 
. lxi, 2 a, b 
246 
. lx, 3' 
228 
f lxiv, 2 a - e 
237 ^ 
■ ^ lxvi, 2 a - k ) 
( lxvii, 4 a - e ) 
250 f 
. lxiv, 3 a - m 
238 
lxvi, 3 a, b 
253 
. lxv, 3 a - i 
247 
lxiv, 3 
248 
( lxv, 4 a - e 
249 ) 
( lxvii, 1 a - h 
255 ) 
. lxvii, 2 a - c 
256 
lxvii, 3 a, b 
258 
. lxvii, 5 a - f 
258 
. x, 12 
44 
Rocks & Groups. 
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Note. Several species of Graptolithus are marked as occurring in the shales of the Hudson-river group only. These are unknown to me 
in any situations, except where the strata are so much disturbed as to render it difficult to identify the Utica slate, in the absence of other 
fossils; and it is quite possible that the black slate containing them is that rock, interplicated and folded with the green slates and shaly 
sandstones, which latter, in undisturbed regions, constitute the Hudson-river group proper. 
Several species of fossils from western localities (particularly of the genus Orthis) have been referred to the period of the Trenton lime¬ 
stone, though it is quite probable they may be found to range through the entire series, and to have existed as late as the period of the 
Hudson-river group of New-York; while others, peculiar to the latter, are found only near the termination of the “ Blue limestone forma¬ 
tion” in western localities. 
[ Paleontology.] 
42 
