880 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



OPHILETA SORDIDA Lesley. See Maclurites sordida. 

 OPHILETA SUBLAXA Miller. See Ophiletina sublaxa. 

 OPHILETA UNIANGULATA Billings. See Ophileta bella. 



OPHILETINA Ulrich and Scofield. Genotype: O. sublaxa Ulrich and Scofiel 

 Ophiletina Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 1028. Gral 

 and Shimer, N. A. Index Fossils, 1, 1909, p. 657. 



Ophiletina angularis Ulrich and Scofield. 



Ophiletina angularis Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 1031, 



pi. 74, figs. 43-46. 



Ophileta angularis Miller, N. A. Geol. Pal., 2d App., 1897, p. 769 (gen. ref.). 

 Black Kiver (Decorah): Near Cannon Falls, Minnesota. 

 Holotype.GM. No. 45946, U.S.N.M. 



Ophiletina sublaxa Ulrich and Scofield. 



Ophiletina sublaxa Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 1030, 



pi. 74, figs. 40-42 and 47. Grabau and Shimer, N. A. Index Fossils, 1, 1909, 



p. 657, fig. 906a, b. 



Ophileta sublaxa Miller, N. A. Geol. Pal., 2d App., 1897, p. 769 (gen. ref.). 

 Black River (Platteville): Minneapolis, Minnesota; Mineral Point, Wisconsin; 



Dixon, Illinois. 

 Cotypes.Cat. No. 45947, U.S.N.M. 



Ophiletina sublaxa depressa Ulrich and Scofield. 



Ophiletina eublaxa var. depressa Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 



1897, p. 1030, pi. 74, fig. 42. 



Stones Kiver (Murfreesboro) : Murfreesboro, Tennessee. 

 HolotypeCa,t. No. 46070, U.S.N.M. 



Ophiletina sublaxa sequens Ulrich and Scofield. 



Ophiletina sublaxa var. sequens Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 



1897, p. 1031. 



Trenton (Prosser) : Wykoff , Minnesota 

 Holotype.C&t. No. 45948, U.S.N.M. 



OPISTHOPTERA Meek. 



Genotype: Ambonychia (Megaptera) casei Meek and Worthen. 

 Opisthoptera Meek, Proc. Acad. Nat. Sci. Philadelphia, 1872, p. 320, footnote; 

 Geol. Surv. Ohio Pal., 1, 1873, p. 131, footnote. White, Amer. Jour. Sci. 

 Arts, 3d ser., 9, 1875, pp. 318-320. Ulrich, Geol. Surv. Ohio, 7, 1893, p. 

 642. Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 982. 

 Megaptera Meek and Worthen, Proc. Chicago Acad. Nat. Sci., 1, 1866, p. 22. 

 (Not Megaptera Gray, 1846.) White, Cincinnati Quart. Jour. Sci., 1, 1874, p. 

 326. Zittel, Handb. Pal., 2, 1881, p. 36. 



Opisthoptera alternata Ulrich. 



Opisthoptera alternata Ulrich, Geol. Surv. Ohio, 7, 1893, p. 644, pi. 49, figs. 9-11. 

 Richmond (Waynesville) : Waynesville, Ohio. 

 Cotypes.C&t. No. 46262, U.S.N.M. 



Opisthoptera ampla Ulrich. 



Opisthoptera ampla Ulrich, Geol. Surv. Ohio, 7, 1893, p. 647, pi. 47, fig. 7. 

 Maysville (Fairmount): Cincinnati, Ohio. 

 Holotype.Csit. No. 46263, U.S.N.M. 



