A List of the Species Constituting the Known Fauna and Flora 

 of the Marcellus Epoch in the State of New York. 



Communicated to James Hall, State Geologist, by J. M. Clarke. 



X Bituminous shales, 

 t Goniatite limestone. 



* Limestone layer, ten feet from the base of the formation. This single 

 layer of limestone extends from Ontario county, on the east, probably to 

 Lake Erie. Its easternmost outcrop is on the banks of Flint creek, near 

 the village of Orleans, and its best development near the village of Staf- 

 ford, Genesee county, where it attains a thickness of from eighteen inches 

 to two feet, has been quarried and has proven of considerable value for 

 undressed work. Its extent and position in the shales was pointed out by 

 Professor James Hall, in his report on the Fourth District of N. Y., 1843. 



Species continuing their existence into the later faunas of the Hamilton 

 group are in italics. 

 Pisces. 



X* Undetermined plates and scales. 

 X Coccosteus sp. ? 



Annelida. 



* Spirorbis sp. n. 

 X Arabellites sp. 



Arthropoda. 



t* Homalonotus DeKayi, Green. 

 X* Phacops rana, Green. 



* Dalmanites ( Cryphceus) Boothi. 



var. Calliteles, Green, 

 t Proetus Haldemani, Hall. 



* P. meter ocephalus, Hall. 



* Cyphaspis craspedota, Hall. 

 X Mesothyra (Dithyrocaris ?) Ven- 

 eris, Hall. 



X Protobalanus Hamiltonensis, 

 Whitfield. 



* Leperditia, sp. 



Cephalopoda. 

 It* Nautilus liratus, Hall. 



t N. bucinum, Hall. 



X N. oriens, Hall. 



* N. cf . magister, Hall, 

 f N. (Discites) Marcellensis. 



It Goniatites discoideus, Hall. 

 X G. plebeiformis, Hall, 



t G. Vanuxemi, Hall, 



t Gyroceras transversum, Hall. 

 X G. sp. 



t Oyrtoceras liratum, Hall. 



to. 



alternatum, Hall. 



t Gomphoceras Fischeri, Hall. 



to. 



cf. Fischeri, Hall. 





solidum, Hall. 



tG. 



oviforme, Hall. 



to. 



Conradi, Hall. 



X O. 



sp. 



X* Orthoceras subulatum, Hall. 



tt o. 



Marcellense,Vanuxem # 



to. 



fustis, Hall. 



to. 



aptum, Hall. 



10. 



Sicinus, Hall. 



10. 



Thestor, Hall. 



* 0. 



Aegea, Hall. 



t* o. 



nuntium, Hall. 



* 0. 



crotalum, Hall. 



*0. 



n. sp., cf. (Edipus, Hall. 



* 0. 



cf. ccelamen, Hall. 



X Bactrites clavus, Hall. 



X B. 



sp. n. 



Pteropoda. 

 X Conularia continens, Hall. 

 X Pharetrella tenebrosa, Hall, 

 t Coleolus (Dentalium) acicula- 



tum, Hall. 

 *X Styliolina fissitrella, Hall, 

 t " " var. strigata, 



Hall. 



X Tentaculites gracilistriatus, Hall. 



