242 Forty-third Report on the State Museum. 



» 



0. deformis, Hall, 1857 = Streptorhynchus deformis, Hall. 



O. delicatula, Billings, 1865. Quebec. 



0. dentata, Meek, 1873 (non Pander). Sjn. for O. (P.) crassa, James. 



O. desmopleura. Meek, 1870. Lower Silurian. 



O. dichotoma. Hall, 1847. Hudson River. 



O. discus. Hall, 1859. Lower Helderberg. 



0. disparilis, Conrad, 1843. Syn. for O. tricenaria, Conrad. 0. dis- 

 parilis being the young of 0. tricenaria, it will be better to adopt the 

 latter name, although the former was first described in the same 

 article. 



0. dubia, Hall, 1858. Keokuk, Warsaw and St. Louis. 



0. eboracensis, S. A. Miller, 1889. Syn. for O. lentiformis. Hall. 



0. electra, Billings, 1862. Quebec. 



O. elegantula, Dalman, 1827. Clinton to Niagara. 



O. elegantula var. parva, Foerste, 1885. Clinton. 



O. ella. Hall, 1861. Hudson Eiver. 



O. emacerata, Hall, 1860. Hudson River. 



0. emacerata, Meek, 1873 (non Hall). Syn. for O. meeki. Miller. 



0. emarginata. See O. oblata var. emarginata. 



O. eminens. Hall, 1859. Lower Helderberg. 



0. erratica. Hall, 1847 = Zygospira erratica, Hall. 



O. eryna. Hall, 1863. Corniferous. 



O. eudocia, Billings, 1862. Quebec. 

 . O. eurekensis, Walcott, 1884. Cambrian. , 



O. euryone, Billings, 1862. Quebec. 



O. evadne, Billings, 1862. Birdseye. 



O.fasciata, Hall, 1852 = ? Orthostrophia fasciata. 



0. fausta, Foerste, 1885. Clinton. 



O. fissicosta, Hall, 1847. Hudson River. 



O. fissiplica, Roemer, 1860. Niagara. 



O. flabellulum, Sowerby, 1839. Niagara. 



O. flava, A. "Winchell, 1865. Kinderhook. 



O. gemmicula, Billings, 1862. Quebec. 



O. gibbosa, Billings, 1857. Chazy to Trenton. 



0. goodwini, Nettelroth, 1889. Hamilton. 



0. halli, Safford, 1869. This may be equal to Orthis strophome- 

 noides. Hall = Orthostrophia strophomenoides. 



O. hamburgensis, "Walcott, 1884. Pogonip. 



O. harttii, Rathbun, 1879. Mid. Devonian of South America. 

 ? O. highlandensis, Walcott, 1886. Mid. Cambrian. 



0. hipparionyx, Hall, 1859 = Hipparionyx proximus, Vanuxem, 1842. 



0. hippolyte, Billings, 1862. Quebec. 



