884 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orbignyella billings! (Foord). 



Monticulipora Billingsi Foord, Contr. Micro-Pal. Cambro-Sil., 1883, p. 8, pi. 1, 



figs. 2-2c. 

 Orbignyella? billingsi Ulrich and Bassler, Smiths. Misc. Coll., 47, 1904, p. 19 



(gen. ref.). 

 Trenton: Ottawa, Ontario. 



Orbignyella expansa (Ringueberg). 



Chsetetes expansus Ringueberg, Bull. Buffalo Soc. Nat. Hist., 5, 1886, p. 20, 



pi. 2, fig. 17. 

 Orbignyella? expansus Ulrich and Bassler, Smiths. Misc. Coll., 47, 1904, p. 19 



(gen. ref.). Bassler, Bull. U. S. Geol. Surv. 292, 1906, p. 26, pi. 10, figs. 



5-8. 

 Clinton (Rochester): Lockport, Niagara Gorge, and Rochester, New York; 



Grimsby, Ontario. 

 Plesiotypes.Cat. No. 35541, U.S.N.M. . 



Orbignyella lamellosa (Ulrich). 



Monticulipora lamellosa Ulrich, Geol. Surv. Illinois, 8, 1890, p. 408, pi. 32, figs. 



4-4b. J. F. James, Jour. Cincinnati Soc. Nat. Hist., 18, 1895, p. 83. 

 Orbignyella lamellosa Ulrich and Bassler, Smiths. Misc. Coll., Quart.. 47, 1904, p. 



20, pi. 6, fig. 10. 



Richmond (Fern vale): Wilmington, Illinois. 

 Fragment of holotype.Ca,t. No. 43303, U.S.N.M. 



Orbignyella magnopora Bassler. 



Orbignyella magnopora Bassler, Bull. U. S. Geol. Surv., 292, 1906, p. 27, pi. 10, 



figs. 9-12. 



Clinton (Rochester): Grimsby, Ontario; Lockport and Rochester, New York. 

 Holotype.C&t. No. 35537, U.S.N.M. 



Orbignyella sublamellosa Ulrich and Baesler. 



Orbignyella sublamellosa Ulrich and Bassler, Smiths. Misc. Coll., Quart., 47, 



1904, p. 19, pi. 6, figs. 7-9. 

 Stones River (Pierce): Murfreesboro, Tennessee. 

 Eolotype.Ca,t. No. 43174, U.S.N.M. 



Orbignyella wetherbyi (Ulrich). 



Monticulipora wetherbyi Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, p. 

 239, pi. 10, figs. 4-4b; 14th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 

 1886, p. 129. James and James, Jour. Cincinnati Soc. Nat. Hist., 11, 1888, p. 

 24. Ulrich, Contr. Micro-Pal. Cambro-Sil., pt. 2, 1889, p. 30; Geol. Minne- 

 sota, 3, 1893, p. 218, pi. 15, figs. 7, 8. Whiteaves, Pal. Foss., 3, 1897, p. 162. 



Orbignyella wetherbyi Ulrich and Bassler, Smiths. Misc. Coll., 47, 1904, p. 19 (gen. 

 ref.). 



Black River: High Bridge, Kentucky (Lowville); Minneapolis, Minnesota 

 (Platteville) ; St. Andrews, Manitoba. 



Cotypes.C*t. No. 43690, U.S.N.M. 



ORBITULTTES RETICULATA Owen. See Ischadites iowensis. 

 ORIOSTOMA (part) Lindstrom. See Poleumita Clarke and Ruedemann. 



ORMATHICHNUS Miller. Genotype: O. moniliformis Miller. 



Ormathichnus Miller, Jour. Cincinnati Soc. Nat. Hist., 2, 1880, p. 222. James, 

 ibid., 8, 1885, pp. 160, 161. Miller, N. A. Geol. Pal., 1889, p. 414. 



