912 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orthoceras olorus Hall. See Cycloceras olorus. 



Orthoceras olorus bafpinensis Sckuchert. See Cycloceraa olorus baffinensis. 



Orthoceras ommaneyi Salter. See Endoceras ommaneyi. 



Orthoceras oneidaense Walcott. 



Orthoceras Oneidaense Walcott, Trans. Albany Inst. 10, 1883 (adv. sheets, 1879), 



p. 22, pi. 1, figs. 7, 7a. 

 Utica: Trenton, Oneida County, New York. 



Orthoceras ordinatum Billings. 



Orthoceras ordinatum Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 350. 

 Canadian (Beekmantown): St. Anne and Township of Oxford, Ontario. 



Orthoceras ortoni Meek. 



Orthoceras Ortoni Meek, Proc. Acad. Nat. Sci. Philadelphia, 1872, p. 330; Pal. 

 Ohio, 1, 1873, p. 155, pi. 13, fig. 8.— Miller, Cincinnati Quart. Jour. Sci., 2, 

 1875, p. 130.— James, J. F., Cincinnati Soc. Nat. Hist., 8, 1886, p. 239.— 

 Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 555, fig. 



Eden (Southgate?): Cincinnati, Ohio. 



Orthoceras orus Hall. See Kionoceras cancellatum. 



Orthoceras ottawaense Billings. 



Orthoceras ottawaense Billings, Geol. Surv. Canada, Rep. Progr. for 1853-1856, 



1857, p. 331. 

 Black River (Leray): La Petite Chaudiere Rapids, Ottawa River, Canada. 



Orthoceras ozarkense Shumard. 



Orthoceras Ozarkense Shumard, Trans. Acad. Sci. St. Louis, 2, 1863, p. 107. — 



Keyes, Missouri Geol. Surv., 5, 1894, 1895, p. 226. 

 Canadian (Yellville): Ozark County, Missouri. 



Orthoceras perannulatum Billings. See Cycloceras crocus. 



Orthoceras perparvum Billings. 



Orthoceras perparvum Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 27 



(adv. sheets 1862). 

 Black River: Pallideau Islands, Lake Huron. 



Orthoceras perroti Clarke. See Cycloceras perroti. 



Orthoceras perseus Billings. 



Orthoceras perseus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 313. 

 Canadian (Beekmantown): Phillipsburg, Quebec. 



Orthoceras persiphonatum Billings. See Huronia persiphonatum. 



Orthoceras pertinax Billings. 



Orthoceras pertinax Billings, Canadian Nat. Geol., 5, 1860, p. 175. 

 Black River (Leray): Pauquettes Rapids, Ottawa River, Canada. 



Orthoceras pictoense Dawson. 



Orthoceras Pictoense Dawson, Canadian Nat., n. s., 9, 1880, p. 343. 

 Silurian: Pictou, Nova Scotia. 



Orthoceras pileolum Billings. 



Orthoceras pileolum Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, 



p. 58. 

 Anticostian (Chicotte): Near Jupiter River, Anticosti. 



