Report of the State Geologist. 243 



O. hybrida, Sowerby, 1839. Niagara. 



O. humboldtii, D'Orbigny, 1842. Silurian of South America. 



0. huroniensis, Castelnau, 1842. Syn. for Strophomena alternata, 

 Conrad, 1838. 



0. Idas, Hall, 1867. Syn. for 0. eryna, Hall. 



O. idonea, Hall, 1867. Hamilton. 



O. imperator, Billings, 1859. Chazy. 



O. impressa, Hall, 1843. Portage and Chemung. 



0. incequalit), Hall, 1858. This has been regarded by Professor 

 Hall as a syn. for Streptorhynchus chemungensis, Conrad. 



O. inca, D'Orbigny, 1842. Devonian of South America. 



O. infera, Calvin, 1878. Hamilton. 



O. insculpta. Hall, 1847. Hudson Eiver. 



0. insignis, Hall, 1859 = Scenidium insigne. 



0. interlineata, D'Archiac and DeVerneuil, 1842, and Hall, 1843 (non. 

 Sowerby). Syn. for O. tioga. Hall. 



0. interstriata, Hall, 1852 = Streptorhynchus interstriatum. 



0. iowensis, Hall, 1858. Hamilton, Chemung and ? Marshall. 



O. iowensis var. furnarius, Hall, 1858. Hamilton. 



O. iphigenia, Billings, 1862. Trenton. 



0. jamesi. Hall, 1861. Hudson River. 



O.jugosa, James, 1879. Syn. for O. meeki, S. A. Miller. 



O. kankakensis, McChesney, 1861. Hudson River. 



0. kaskaskiensis, McChesney, 1860 = Streptorhynchus kaskaskiensis. 



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



0. kennicotti, McChesney, 1861. Syn. for O. retrorsa, Salter. 



0. keokuk, Hall, 1858 = Derbya keokuk. 



0. lasallensis, McChesney, 1860. Syn. for Derbya crassa, Meek and 

 Hayden sp. 



O. laticostata, D'Orbigny, 1842. Devonian of South America. 



0. [Platystrophia] laticostata [James,] Meek, 1873. Hudson River. 

 ? 0. laurentina, Billings, 1857. Mid. Silurian. 



0. lenticularis, Vanuxem, 1842 (non Wahlenberg, 1821). Syn. for 

 O. lentiformis. Hall. 



0. lentiformis. Hall, 1843. Corniferous. 0. lenticularis and 0. lenti- 

 formis were used by Professor Hall for the same species in his Geol. 

 Rep., Fourth Dist, N. Y., p. 175. As Vanuxem's name is preoccupied, 

 I shall use 0. lentiformis. Hall, for that species. 



leonensis, Hall, 1867. Syn. for Orthis tenuilineata. Hall. 



O. lepida. Hall, 1860. Hamilton. 



0. lepis. Identified by D'Archiac and DeVerneuil, 1842, as occurring 

 in Kentucky. Not recognized since. 



