914 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orthoceras pylades Billings. 



Orthoceras Pyladea Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, 



p. 84. 

 Niagaran (Lockport): Grimsby, Ontario. 



Orthoceras python Billings. See Actinoceraa (Deiroceras) python. 



Orthoceras rapax Billings. See Endoceras rapax. 



Orthoceras raptor Billings. 



Orthoceras raptor Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, 



p. 57. 

 Anticostian (Jupiter River): Near Jupiter River, Anticosti. 



Orthoceras recedens Barrande. 



Orthoceras recedens Barrande, Syst. Sil. du Boheme, 4me ser., 2, 1870, pi. 433, 



figa.3, 4. 

 Ordovician: Newfoundland. 



Orthoceras rectiannulatum Hall. See Cycloceras? rectiannulatum. 



Orthoceras recticameratum Hall. 



Orthoceras recticameratum Hall, Pal. New York, 1847, p. 46, pi. 11, fig. Id. — 



Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 48. 

 Black River (Lowville): Watertown, etc., New York. 



Orthoceras reetum Worthen. 



Orthoceras rectum Worthen, Geol. Surv. Illinois, 6, 1875, p. 504, pi. 26, fig. 3.— 

 Clarke and Ruedemann, Mem. New York State Mus., 5, 1903, p. 78, pi. 12, 

 fig. 9.— Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 48. 



Orthoceras crebescens Hall and Whitfield, Geol. Ohio, 2, 1875, p. 148, pi. 9, fig. 2. 



Niagaran: Joliet, Illinois (Racine); Shelby, New York, and Cedarville, Ohio 

 (Guelph). 



Orthoceras rectum Junius Foerste. 



Orthoceras (Eu-orthoceras) rectum var. junior Foerste, Proc. Boston Soc. Nat. 



Hist., 24, 1889, p. 278, pi. 7, figs. 1, 2. 

 Orthoceras (Eu-orthoceras) rectum var. Junius Foerste, Geol. Surv. Ohio, Pal. 7, 



1893, p. 32, figs. 1, 2. 

 Upper Medinan (Brassfield): Hanover, Indiana. 



Orthoceras remus Billings. 



Orthoceras remus Billings, Cat. Sil. Foss. Anticosti Geol. Surv. Canada, 1866, 



p. 85. 

 Niagaran (Lockport): Grimsby, Ontario. 



Orthoceras repens Billings. 



Orthoceras repens Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 312. 

 Canadian (Beekmantown): Phillipsburg, Quebec. 



Orthoceras rhythmoides (Foerste). 



Orthoceras (Eu-orthoceras) rhythmoides Foerste, Proc. Boston Soc. Nat. Hist., 24, 



1889, p. 279, pi. 8, fig. 2. 

 Upper Medinan (Brassfield): Near Carlisle, Ohio. 



Orthoceras richardsoni Barrande. See Actinoceraa richardaoni. 



