BIBLIOGRAPHIC LIST OP GENERA AND SPECIES. 915 



Orthoceras rigidum Hall. 



Orthoceras rigidum Hall, Pal. New York, 3, 1861, p. 344, pi. 70, figs. 3a-d. Bil- 

 liiigs, Proc. Portland Soc. Nat. Hist., 1, 1863, p. 119. Newell, Proc. Boston 

 Soc. Nat. Hist., 23, 1888, p. 467. Maynard, Maryland Geol. Surv., Low. 

 Dev., 1913, p. 488, pi. 88, fig. 5 



Helderbergian: Herkimer County, New York (Manlius transition); Devil's Back- 

 bone, Maryland (Keyser). 



?Niagaran: Peru, Indiana. 



Orthoceras rogersense Foerste. 



Orthoceras rogersensia Foerste, Jour. Cincinnati Soc. Nat. Hist., 21, 1914, p. 143, 



pi. 1, figs. 17a, b. 

 Trenton (Upper): Rogers Gap, Kentucky. 



ORTHOCERAS ROTTERMUNDI Barrande. See Endoceraa rottermundi. 

 ORTHOCERAS ROTULATUM Billings. See Actinoceras rotulatum. 



Orthoceras sayi Billings. 



Orthoceras Sayi Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 315. 

 Canadian (Beekmantown) : Phillipsburg, Quebec. 



Orthoceras scalariforme Schuchert. 



Orthoceras scalariformis Schuchert, Proc. U. S. Nat. Mus., 22, 1900, p. 170, pi. 



12, figs. 17, 18. 



Mohawkian: Head of Frobisher Bay, Baffin Land. 

 Holotype.G&t. No. 28195, U.S.N.M. 



ORTHOCERAS SCAMMONI McChesney. See Kionoceras cancellatum. 



Orthoceras schucherti Maynard. 



Orthoceras schucherti Maynard, Maryland Geol. Surv., Low. Dev., 1913, p. 487, 



pi. 88, fig. 4. 

 Helderbergian (Keyser): Cumberland, Maryland. 



ORTHOCERAS SEDGWICKI Billings. See Actinoceras sedgwicki. 



Orthoceras selkirkense Whiteaves. 



Orthoceras Selkirkense Whiteaves, Trans. Royal Soc. Canada, 9, sec. 4, 1892, 

 p. 82, pi. 8, figs. 2, a, b; Pal. Foss., Geol. Surv. Canada, 3, pt. 2, 1895, p. 123 

 (loc. occ.) ; ibid., pt. 3, 1897, p. 212. 

 Black River or Richmond: East Selkirk, Manitoba. 



Orthoceras selwynl Billings. 



Orthoceras selwyni Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 161 (adv. 



sheets, 1862). Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 2, 1895, 



p. 98. 

 Niagaran (Guelph): Gait, Ontario. 



ORTHOCERAS SEMEPLANATUM Whiteaves. See Jovellania semiplanata. 

 ORTHOCERAS SERVILE Billings. See Tripteroceras servile. 

 ORTHOCERAS SHUMARDI Billings. See Geisonoceraa shumardi. 



Orthoceras sieboldl Billings. 



Orthoceras Sieboldi Billings, Cat. Sil. Foss. Anticoeti, Geol. Surv. Canada, 1866, 



pp. 23, 58. 

 Richmond (English Head) and Gamachian: Near West End Light House and 



Gamache Bay, Anticosti. 



