BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 901 



Orthoceras areticum Foorde. 



Cyrtoceras sp. Etlieridge, Quart. Jour. Geol. Soc. London, 34, 1878, p. 608. 

 Orthoceras arcticum Foord, Cat. Foss. Ceph. Britisli Mus., 1, 1888, p. 38, fig. 3. 

 Niagaran: Oflley Island, Kennedy Channel, Arctic America. 



Orthoceras areuolineatum Ruedemann. 



Orthoceras areuolineatum Ruedemann, Bull. New York State Mus., 162, 1912, 



pi. 8, figs. 1, 2. 

 Trenton (Canajohariej: Fort Edward, New York. 



Orthoceras arciioliratum Hall. 



Orthoceras arciioliratum Hall, Pal. New York, 1, 1847, p. 198, pi. 42, figs. 7a-c. — 

 Emmons, Amer. Geology, 1, pt. 2, 1S55, p. 149, pi. 12, fig. 4.— Foord, Cat, 

 Foss. Ceph. British Mus., 1, 1888, p. 10. — Keyes, Missouri Geol. Surv., 5, for 

 1894, 1S95, p. 227.— Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 542, 



fig- 

 Trenton: Middleville and Watertown, New York. 



Orthoceras atlanticum Barrande. See Endoceras atlanticum. 



Orthoceras atticus Billings. 



Orthoceras Atticus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 312. 

 Canadian (Beekmantown): Stanbridge, Quebec. 



Orthoceras autolycus Billings. 



Orthoceras Autolycus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 91, 



(adv. sheets, 1862.) 

 Ozarkian? (Levis — erratics): Point Levis, Quebec. 



Orthoceras (Ormoceras) Backh Barrande. See Actinoceras beloitense and A. 

 whitei. 



Orthoceras balteatum Billings. See Spyroceras balteatum. 



Orthoceras bartonensis Spencer. See Dawsonoceras annulatum. 



Orthoceras (Ormoceras) Bayfieldi Zittel. See Actinoceras (Ormoceras) bayfieldi. 



Orthoceras Beauportense Whiteaves. See Syproceras beauportense. 



Orthoceras hecki Billings. 



Orthoceras becki Billings, Canadian Nat. Geol., 4, 1859, p. 362, fig. 11a; Geol. 

 Canada, Geol. Surv. Canada, 1863, p. 121, fig. 35. — Lesley, Geol. Surv. 

 Pennsylvania, Rep. P. 4, 1889, p. 543, fig. 

 Canadian (Romaine): Mingan Islands, Quebec. 



Orthoceras bellatulum Billings. See Kionoceras bellatulum. 



Orthoceras (Actinoceras) beloitense Whitfield. See Actinoceras beloitense. 



Orthoceras beltrami Clarke. 



Orthoceras beltramii Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 7S9, pi. 55, fig. 10. 

 Trenton (Prosser): Wykoff, Minnesota. 



Orthoceras (Actinoceras) Bigsbyi of authors. See Actinoceras bigsbyi and A. 

 beloitense. 



Orthoceras bilineatum Whitfield. See Protocycloceras whitfiehli. 



Orthoceras bilineatum Clarke. See Spyroceras bilineatum. 



