924 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orthonychia obtusa Whiteaves. 



Orthonychia obtusa Whiteaves, Geol. Surv. Canada, Ann. Rep., n. e., 14, App. F, 



1904, p. 51; Pal. FOBS., 3, pt. 4, 1906, p. 260, pi. 29, figs. 5, 5a. 

 Niagaran: Ekwan River, Canada. 



ORTHORHYNCHULA Hall and Clarke. Genotype: Orthis(?) linneyi James. 



Orthorhynchula Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 181; 13th 



Ann. Rep. New York State Geol., 1895, p. 824. Schuchert, Bull. U. S. Geol. 



Surv., 87, 1897, p. 83. Williams, Bull. U. S. Geol. Surv., 165, 1900, p. 59. 



Schuchert, Zittel-Eastman Textb. Pal., 1913, p. 396. 



Orthorhynchula linneyi (James). 



Orthis? linneyi James, Paleontologist, 5, 1881, p. 41. Nettelroth, Kentucky Foss. 



Shells, Mem. Kentucky Geol. Surv., 1889, p. 41, pi. 34, figs. 7-18. 

 Orthorhynchula linneyi Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 181, 



pi. 56, figs. 10-13, 19. Grabau and Shimer, N. A. Index Fossils, 1, 1907, 



p. 281, figs. 342d-e. Bassler, Virginia Geol. Surv., Bull. 2a, 1909, pi. 14, figs. 



10-12. Foerste, Bull. Sci. Lab. Denison Univ., 14, 1910, p. 24, pi. 3, fig. 10; 



Bull. 17, 1912, p. 132, pi. 11, fig. 5. 

 Trenton: Boyle County, etc., Kentucky (Perryville-Cynthiana); Tennessee 



(Catheys). 



Mayeville: Ohio, Kentucky (Fairmount) ; Tennessee (Leipers); Virginia; etc. 

 Plesiotypes. Cat. No. 51186, U.S.N.M. 



ORTHOSTOMA Conrad. See Eccyliomphalus subgenus Orthostoma. 



ORTHOSTROPHIA Hall. Genotype: Orthis strophomenoides Hall. 



Orthostrophia Hall, 2d Ann. Rep. New York State Geol., 1883, pi. 36, figs. 32- 

 34. Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 199, 223, 253; llth 

 Ann. Rep. New York State Geol., 1894, p. 267. Grabau and Shimer, N. A. 

 Index Fossils, 1, 1907, p. 256. Schuchert, Zittel-Eastman Textb. Pal., 1913, 

 p. 382. 



Shizonema (subgenus of Hebertella) Foerste, Bull. Sci. Lab. Denison Univ., 14, 

 1909, p. 77. 



Shizoramma (Schizonema preoccupied) Foerste, ibid., 17, 1912, p. 139. (Geno- 

 type: S. fissistriata Foerste). 



Orthostrophia dixoni Foerste. 



Orthostrophia dixoni Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 74, pi. 



4, fig. 65. 

 Niagaran (Brownsport) : Glade southwest of Dixon Spring, Tennessee. 



Orthostrophia (Schizorainma) fasciata (Hall). 



Orthis fasciata Hall, Pal. New York, 2, 1852, p. 255, pi. 52, fig. 8. 

 Orthostrophia? fasciata Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 200, 



223. Grabau, Bull. New York State Mus., 45, 1901, p. 187, fig. 96. Grabau 



and Shimer, N. A. Index Fossils, 1, 1907, p. 256, fig. 307. 

 Hebertella (Schizonema) fasciata Foerste, Bull. Sci. Lab. Denison Univ., 14, 



1909, p. 77, pi. 4, fig. 71. 

 Clinton: Rochester and Lockport, New York (Rochester); New Marion, Indiana 



(Osgood). ' 



Orthostrophia (Schizoramma) flssiplica (Roemer). 



Orthis fissiplica Roemer, Die silurische Fauna West. Tennessee, 1860, p. 64, pi. 5, 



fig. 5; Cincinnati Quart. Jour. Sci., 1, 1874, p. 252. 

 JDalmanella fissiplica Foerste, Jour. Geol., 11, 1903, p. 711. 



