900 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



ORTHOCERAS Continued. 



Orthoceratites Fischer de Waldlieim, 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. reU. 

 Clinton (Irondequoit): Lockport, New York. 



Orthoceras aequale (Emmons). 



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

 Orthoceras sequale 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 alfeersi 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 Loxoceraa 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 (Platteville) : Mineral Point, Wisconsin. 



ORTHOCERAS AMYCUS Hall. See Cycloceras amycus. 

 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 antenor Billings. 



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

 Chazyan: Mingan Islands, Canada. 



ORTHOCERAS ANTICOSTIENSE Billings. See Actinoceras anticostiense. 



