910 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



ORTHOCERAS MAGNISULCATUM Billings. See Kionoceras magnisulcatum. 



Orthoceraa marginale Owen. Not recognized. 



Orthoceras marginale Owen, Geol. Expl. Iowa, Wisconsin, Illinois, 2d ed., 1844, 



p. 70, pi. 16, fig. 6. 

 Black River (Platteville): Wisconsin. 



ORTHOCERAS MARO Billings. See Spyroceras maro. 



Orthoceras medon Billings. 



Orthoceras Medon Billings, Cat. Sil. FOBS. Anticosti, Geol. Surv. Canada, 1866, 



p. 57. 

 Anticostian(Chicotte): Southwest Point, Anticosti. 



ORTHOCERAS MEDULLARE Hall. See Protokionoceras medullare. 



Orthoceras meekl Miller. 



Orthoceras meeki, Miller, Quart. Jour. Sci., 2, 1875, p. 126, text fig. 12; N. A. 



Geol. Pal., 1889, p. 449, fig. 753. 

 Maysville (Fairmount): Cincinnati, Ohio. 



Orthoceras menelaus Billings. 



Orthoceras Menelaus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 26. 



(Adv. sheets, 1862.) 

 Black River: Wolfe Island, near Kingston and Pointe Claire, Island of Montreal, 



Canada. 



ORTHOCERAS (LOXOCERAS) MILLERI Foerste. See Loxoceras milleri. 



Orthoceras minganense Billings. 



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



1857, p. 319; Canadian Nat. Geol., 4, 1859, p. 463 (loc. occ.). 

 Chazyan (Mingan): Mingan Islands, Canada. 



Orthoceras mlnnesotense Sardeson. 



Orthoceras minnesotense Sardeson, Bull. Minnesota Acad. Nat. Sci., 4, 1896, p. 



77, pi. 3, figs. 11, 12. 

 St. Peter: South St. Paul, Minnesota. 



ORTHOCERAS MISSISQUOI Billings. See Cyrtoceras missisquoi. 



Orthoceras modes turn Ruedemann. 



Orthoceras modestum Ruedemann, Bull. New York State Mus., 90, 1906, p. 436. 



fig. 14, pi. 12, figs. 1-3. Grabau and Shimer, N. A. Index Fossils, 2, 1910, 



p. 48. 

 Chazyan (Valcour): Valcour Island and near Chazy, New York; Isle La Motte, 



Vermont. 



Orthoceras mohrl Miller. 



Orthoceras Mohri Miller, Cincinnati Quart. Jour. Sci., 2, 1875, p. 124, fig. 10. 



James, J. F., Jour. Cincinnait Soc. Nat. Hist., 8, 1886, p. 238. Foord, Cat. 



Foss. Ceph. British Mus., 1, 1888, p. 15. Miller, N. A. Geol. Pal., 1889, p. 



449, fig. 564. turnings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, 



p. 1038, pi. 51, fig. 3. 

 Richmond: Versailles, Indiana. 



ORTHOCERAS MONILIFORME Hall. See Loxoceras moniliforme. 

 ORTHOCERAS MONTREALENSIS Billings. See Endoceras inontrealense. 



