TABLE OF SPECIES. 



320 



GENERA AM) SPKCIES. 



Conularia tientonensis 



— granulafa, 



— papiUata, 



— gracilis, 

 Tlieca triangularis, 



Hall 



CRUSTACEA. 

 Ulsenus arctvirus, " 



— crassicauda ? Wahltnberg . . 



— crassicauda, " 



— trentonensis, Emmons 



— latidorsata, Hall 



Thaleops (lUienus) ovatus, Conrad . , 

 Asaphus ? obtusus. Hall 



— marginalis, " ..... 



extans, " 



nodostriatus, " 



latimarginata, ** ..... 



Isotelus canalis, Conrad 



— S'o''^ ■ Oekay 



— gigas, 



Hall 



Ogygia ? velusta, 



AciJaspis trentonensis, " . .. 



— spiniger, " ... 

 Platynotus trentonensis, Conrad . . 

 Ceraurus ? s^. indet 



pleurexanthemus. Green, 



— vigilans. Hall . . . 



— pustulosus, " . • . 

 Calj mene mullicosta, " 



2 — 



3 — 



4 — 

 1 



— beckii, Green . 



— senaria, Conrad. ... 



— (sp. indet ) 



Phacops callicephalus, Hall 



— ? laticaudus, " 



Trinucleus concentricus, Eaton 



Olenus asaphoides, Emmons. . . . 

 — unduloslriatus. Hall. . . 

 Agnostus lobatus, " 

 Cytlierina (sp. indet ) 



Plat>! and figure. 



li.v, 4 a-/ 

 lix, 5 a, b 

 lix, G a, b 

 lix, 1 a,b 

 Ixxxvii, I a - d 



iv (bis), 12 



iv (bis), 13 



Ix, 4 a - rf 



Ix, 5 



Ix, fi a, 6 



Ixvii, 6 a - c 



iv (bis), 14 



iv (bis), 15 



Ix, 2, 2 a 



Ixi, 1 a, b 



Ixvi, 4 a, A 



iv (bis), n, 18, 19 



iv (bis), I'j 



Ix, 7; Ixi, 3, 4 ) 



Ixii, 1, 2; Ixiii ) 



Ixvi, 5 



Ix, 1 



Ixiv, 4 a - f 



Ixiv, 5 



Ixiv, 1 o - e 



iv (bis), 20 



Ixv, 1 a - m } 



Ixvi, \ a~ h J 



Ixv, 2 a - A 



Ixi, 2 a, b 



Ix, '3 



Ixiv, 2 a - e 



2 o- At -i 

 4 o - e 5 



3 a - m 

 3 o, 6 



3 a - i 

 3 

 A a- t 



1 a-h 



2 a-c 



3 a,b 

 5a-f 



Page. 



242 



250 I 



Rocks & Groups. 



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+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



3| 



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Note. Several species of Graptolithus are marked a? occurriiii» in the shales of the Hudson-river croup only. These are unknown to mo 

 ill any situniioiis, 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 siate coutaining ihem is that rock. inierplicateU and folded with the green slates and shaly 

 sandstones, which Intter, in undisturbed reg-ionsj constitute the IIud=on.river group proper. 



t^everal species of fossils from western localities (particularly of the genus Orthis) have been referred to (he period of the Trenton lime- 

 3tc>nc, though it is quite probable they may be found to range through the entire series, and to have existed a-* 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. 



[ PaLjEONTOLOGY.] 



42 



