900 BULLETIN" 92, UNITED STATES NATIONAL MUSEUM. 



OBTHO CER AS— Continued. 



Ortlioceratites Fischer de Waldheim, Oryctographie Gouv. de Moscou, 1830, 

 p. 124. — Eichwald, Zool. Specialis, pt. 2, Vilnae, 1830, p. 31. — Steininger, 

 Mem. Soc. Geol. France, 1, 1834, p. 368. — Troost, Mem. Soc. Geol. France, 

 3, 1838, p. 87.— D'Orbigny, Prodr. de Pal., 1, 1849, p. 2. 



Orthoceras abnorme Hall. See Actinoceras abnorme. 



Orthoceras? abruptum Hall. 



Orthoceras abniptum Hall, Pal. New York, 2, 1852, p. 97, pi. 29, fig. 4a, b. 

 Cyrtoceras? abruptum Hall, Pal. New York, 5, pt. 2, 1879, p. 220 (gen. ref.L 

 Clinton (Irondequoit): Lockport, New York. 



Orthoceras aequale (Emmons). 



Orthoceratites sequalis Emmons, Nat. Hist. New York, Geol., 2, 1842, p. 404, fig. 1. 

 Orthoceras gequale Miller, N. A. Geol. Pal., 1889, p. 446 (gen. ref .). — Lesley, Geol. 



Surv. Pennsylvania, Rep. P 4, 1889, p. 541, figs. 

 Trenton: New York. 



Orthoceras albersi Miller and Faber. 



Orthoceras albersi Miller and Faber, Jour. Cincinnati Soc. Nat. Hist., 17, 1894, p. 

 140, pi. 8, figs. 1-4— Miller, N. A. Geol. Pal., 2d App., 1897, p. 776, fig. 1423. 

 Trenton (Upper): West Covington, Kentucky. 



Orthoceras alienum Hall. 



Orthoceras alienum Hall, 20th Rep. New York State Cab. Nat. Hist., 1868, p. 354; 



rev.ed., 1870, p. 414, pi. 24, figs. 6-7. 

 Niagaran (Racine): Racine, Wisconsin. 



Orthoceras allumettense Billings. See Loxoceras allumettense. 



Orthoceras amplicameratum Hall. 



Orthoceras amplicameratum Hall, Pal. New York, 1, 1847, p. 205, pi. 51, figs. 



la-g. — Emmons, Amer. Geology, 1, pt. 2, 1855, p. 150. — Hitchcock, Geol. 



Vermont, 1, for 1861, 1862, p. 298, fig. 210— James, J. F., Jour. Cincinnati, 



Soc. Nat. Hist., 8, 1886, p. 237.— Grabau and Shimer, N. A. Index Fossils, 2, 



1910, p. 48, fig. 1247. 

 Orthoceras cf. amplicameratum Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 790, 



pi. 47, fig. 19. 

 Trenton: Middleville, New York; Preston, Minnesota. 

 ?Black River ( Platte ville): Mineral Point, Wisconsin. 



Orthoceras amycus Hall. See Cycloceras aniycus. 



Orthoceras anceps Billings. See Gonioceras anceps. 



Orthoceras angulatum Hall. See Kionoceras cancellatum. 



Orthoceras annellus Conrad. See Spyroceras anellus. 



Orthoceras annulata Eaton. See Dawsonoceras annulatum. 



Orthoceras annulatum var. americanum Whiteaves. See Dawsonoceras annu- 

 latum . 



Orthoceras anterior Billings. 



Orthoceras Antenor Billings, Canadian Nat. Geol., 4, 1859, p. 463. 

 Chazyan: Mingan Islands, Canada. 



Orthoceras anticostiense Billings. See Actinoceras anticostiense. 



