916 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



ORTHOCERAS SIMPSONI Billings. See Narthecoceras simpsoni. 



Orthoceras simulator Hall. 



Orthoceras simulator Hall, 28th Rep. New York State Mus. Nat. Hist., doc. ed., 

 1877, pi. 27, figs. 11, 12; mus. ed., 1879, p. 179, pi. 27, figs. 11, 12; llth Ann. 

 Rep. Indiana Dep. Geol. Nat. Hist., 1882, p. 322, pi. 28, figs. 11, 12; pi. 33, 

 figs. 1, 2. Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 557, figs. 

 Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 49. 

 Niagaran (Waldron): Waldron, Indiana. 



Orthoceras sociale Hall. 



Orthoceras gregarium Hall (not Sowerby, 1839), Rep. Supt. Geol. Surv. Wisconsin, 



1861, p. 46. 

 Orthoceras sociale Hall in Miller N. A. Pal. Foss., 2d ed., 1877, p. 245. J. F. 



James, Amer. Geol., 5, 1890, p. 355. Whitfield, Mem. Amer. Mus. Nat. 



Hist., 1, pt. 2, 1895, p. 71, pi. 8, figs. 16-23. Clarke, Geol. Minnesota, 3, pt. 2, 



1897, p. 789, pi. 55, fig. 7. 

 Orthoceraa (Geisonoceras) sociale Grabau and Shinier, N. A. Index Fossils, 2. 



1910, p. 48, fig. 1248. 

 Richmond (Maquoketa): Maquoketa Creek, etc., Iowa; Scales Mound, etc., 



Illinois. 



Orthoceras sordidum Billings. 



Orthoceraa sordidum Billings, Canadian Nat. Geol., 4, 1859, p. 363, fig. Hi, k; 



Geol. Canada, Geol. Surv. Canada, 1863, p. 121, fig. 39a, b. Lesley, Geol. 



Surv. Pennsylvania, Rep. P 4, 1889, p. 558, figs. 

 Canadian (Romaine): Mingan Islands, Quebec. 



ORTHOCERAS SORDIDUM Billings. See Endoceras montrealense. 

 ORTHOCERAS (HURONIA) SPH^ROIDALE Stokes. See Actinoceras sphaeroidale. 



Orthoceras spissiseptum Dwight. 



Orthoceras spissiseptum Dwight, Amer. Jour. Sci. Arts, 3d ser., 27, 1884, p. 256, 



pi. 7, fig. 12. 

 Canadian (Beekmantown) : Rochdale, New York. 



Orthoceras (Spyroceras?) spyroceroides Foerste. 



Orthoceras (Spyroceras?) spyroceroides Foerste, Geol. Surv. Ohio, Pal. 7, 1893, 



p. 545. 

 Upper Medinan (Brassfield): Near New Carlisle, Ohio. 



Orthoceras stritelineatum McChesney. 



Orthoceras striselineatum McChesney, Desc. New Fossils, 1861, p. 94. 

 Niagaran (Racine): Chicago, Illinois. 



Orthoceras strigatum Hall. 



Orthoceras strigatum Hall, Pal. New York, 1, 1847, p. 205, pi. 56, figs, la-f. 



Emmons, Amer. Geology, 1, pt. 2, 1855, p. 150. Hitchcock, Geol. Vermont, 



1, 1861, 1862, p. 298, fig. 211. 

 Trenton: Middle ville, New York. 



ORTHOCERAS STRIX Hall and Whitfield. See Kionoceras strix. 



ORTHOCERAS SUBARCUATUM HALL. See Loxoceras moniliforme and Spyroceras 

 clintoni. 



