Report of tee State Geologist. 241 



0. hilohata [Delthyris bilobata, Conrad, 1838]. Syn. for O. varica, 

 Conrad. 



0. Msulcata, Emmons, = ? Camarella bisulcata. 



O. borealis, Billings, 1859. Chazy to Tx-enton. 



O. buchii D'Oi'bigny, 1842. Carboniferous of South America. 



O. canalis. Hall, 184:3. Syn. for 0. elegantula, Dalman. 



0. carbonaria, Swallow. Syn. for 0. pecosi, Marcou. 



O. carinata. Hall, 1843. Chemung. 



0. carleyi, Hall, 1860. Syn. for O. retrorsa, Salttr. 

 ? O. centrilineata. Hall, 1847. Loraine. 



0. centrosa, S. A. Miller, 1889. Syn. for O. (Platystrophia) crassa, 

 James. 



O. charlotte, N. H. Winchell, 1880. Trenton. 



0. cincinnatiensis, Miller, 1883. Hudson River. 



0. circularis, N. H. Winchell, 1880 (non Soweiby). Trenton. 



O. circulus. Hall, 1843. Clinton. 



O. clarkensis. Swallow, 1863. Keokuk. 



O. cleobis. Hall, 1863. Onondaga. 



O. clytie. Hall, 1861. Trenton. 

 ? O. coloradoensis, Shumard, 1860. Potsdam. 



0. coloradoensis, Meek, 1870 (non Shumard). Syn. for O. desmo- 

 pleura. Meek. 



O. concinna. Hall, 1859. Lower Helderberg. 



0. conradi, Castelnau, 1843. Syn. for Hipparionyx prosimus, 

 Vanuxem. 



O. conradi, N. H. Winchell, 1880. Trenton. 



O. cooperensis. Swallow, 1863. Warsaw. 



O. cora, D'Orbigny, 1842. Carboniferous of South America. 



O. corinna, Billings, 1865. Quebec. 



O. costalis. Hall, 1847. Chazy. 



0. costata, Hall, 1845 [non Sowerby, 1839]. Syn. for O. cincinnati- 

 ensis. Miller. 



O. [Platystrophia] crassa, James, 1874. Hudson River. 



O. crispata, Emmons, 1842. Loraine. 



O. cumberlandia. Hall, 1859. Oriskany. 



O. cuneata, Owen, 1852. Hamilton. 



O. cyclas. Hall, 1860. Marcellus to Hamilton. 



0. cyclus, James, 1874. Syn. for 0. multisecta [James] Meek. 



0. (Platystrophia) cypha, James, 1874. Hudson. 



O. dalyana, Miller, 1881.* Burlington. 



O. davidsoni, De Verneuil, 1840. Mid. Sil. and Niagara. 



0. daytonensis, Foerste. Clinton. 

 31 



