916 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orthoceras simpsoni Billings. See Narthecoceras simpsoni. 



Orthoceras simulator Hall. 



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

 1877, pi. 27, figs. 11, 12; mus. ed., 1879, p. 179, pi. 27, figs. 11, 12; 11th 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 gregari um Hall (notSowerby, 1839), Rep. Supt. Geol. Surv. Wisconsin, 



1861, p. 40. 

 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. 

 Orthoceras (Geisonoceras) sociale Grabau and Shimer, N. A. Index Fossils, 2, 



1910, p. 48, fig. 1248. 

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



Illinois. 



Orthoceras sordidum Billings. 



Orthoceras 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) spbleroidale Stokes. See Actinoceras sphasroidale. 



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 striselineatum McChesney. 



Orthoceras strioelineatum 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: Middleville, New York. 



Orthoceras strix Hall and Whitfield. See Kionoceras strix. 



Orthoceras subarcuatum Hall. See Loxoceras moniliforme and Spyroceras 

 clintoni. 



