HISTORICAL SKETCH. 



XX111 



stones, although of small thickness, are well defined and each shows its characteristic fossils 

 similar to those of the same strata in New York. There are twenty-five fossils described 

 and figured (nine for the first time); of these the following are from the last mentioned 

 limestones and the Hudson River group: 



Phenopora multipora, n. sp. 

 Clathropora flabellata, n. sp. 

 Chastetes lycoperdon. 

 Schizocrinus nodosus ? 

 EchinosphEerites ? n. sp. 

 Murchisonia major, n. sp. 

 Asaphas barraadi, n. sp. 



Harpes escanabiie, D. sp. 

 Phacops callicephalus. 

 Catenipora gracilis, n. sp. 

 Sarcinula ? obsoleta, n. sp. 

 Modiolopsis pholadiforruis, n sp. 

 Modiolopsis modiolaris. 

 Ambonychia carinata. 



Fossils listed from the Birdseye, Black River and Trenton limestones are given below : 



Plants. 



Palasophycus 



Chtetetes lycoperdon. 

 Streptelasma corniculum. 

 - profunda. 

 Stictopora ramosa. 

 S. elegantula. 

 S. n. sp. 



Schizocrinus nodosus. 

 Homocrinus ? 



Lingula asqualis. 

 Orthis testudinaria. 

 O. subsequata. 

 O. pectinella. 

 O. disparilis. 

 Leptsena alternata. 



Ambonychia obtusa. 

 Nucula levata. 



Subulites elongata. 

 Murchisonia major. 

 M. bellicincta. 

 M. n. sp. 

 M. angulata. 

 Pleurotomaria ienticularis. 



Buthotrephis succulens. 

 Phytopsis tubulosum. 



Corals. 



Stictopora n. sp. 

 Phenopora multipora, n. sp. 

 Escharopora recta. 

 Clathropora flabellata, n. sp. 

 Aulopora arachnoidea. 

 Graptolithus amplexicaulis. 



Crinoidea. 



Echinospha;rites n. sp, 

 nov. genus. 



Brachiopoda. 



Leptaena fllitexta. 

 L. sericea. 

 L. deltoidea. 

 L. tenuistriata. 

 Spirifer lynx. 

 Atrypa increbescens. 

 Atrypa recurvirostra. 



Acephala. 



Tellinomya dubia. 

 Edmondia ventricosa. 



Gasteropoda. 



Pleurotomaria umbilicata. 

 P. rotuloides. 

 P. subconica. 

 Bucania bidorsata. 

 Bellerophon bilobatus. 

 Cyrtolites compressus. 

 Carinaropsis n. sp. 



Cephalopoda. 



Orthoceras multicameraturn. Ormoceras tenuifllum. 



O. fusiforme. Endoceras proteiforme. 



Gonioceras anceps, (west of the limits of the district). 



Crustacea. 



Isotelus gigas. 



Illaenus crassicauda? 



Calymene blumenbachii var. senaria. 



Phacops callicephalus. 



Ceraurus pleurexanthemus. 



Asaphus extans. 

 A. barrandi, n. sp. 

 Harpes escanabiEe, n. sp. 

 Lichas trentonensis. 

 Cytherina fabulites. 



