BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 885 



Ormathichnus moniliformis Miller. 



Ormathichnus moniliformia Miller, Jour. Cincinnati Soc. Nat. Hist., 2, 1884, p. 



222, pi. 14, figs. 4, 5. 

 Eden (Economy): Walker Mill Road, Cincinnati, Ohio. 



ORMOCERAS Stokes. See Actinoceras Bronn. 

 ORMOCERAS ANCEPS Chapman. See Gonioceras anceps. 

 ORMOCERAS BRONGNIARTI Owen. See Actinoceras richardsoni. 

 ORMOCERAS LYONI Hector. See Actinoceras bigsbyi. 

 ORMOCERAS MONILIPORME Hall. See Loxoceras moniliforme. 



ORMOCRINUS Springer. Genotype: Centrocrinus tennesseensis Worthen. 



Ormocriniis Springer, Mon. Crin. Flex., Smith. Inst. (in press). 



Ormocrinus tennesseensis (Worthen). 



Centrocrinus tennesseensis Worthen, Geol. Surv. Illinois, 8, 1890, p. 95, pi. 14, 



fig. 1. 

 Idiocrinus? tennesseensis Wachsmuth and Springer, Mem. Mus. Comp. Zool., 



Harvard, 20, 1897, p. 206, pi. 18, fig. 11. 



Ormocrinus tennesseensis. Springer, Mon. Crin. Flex., Smith. Inst. (in press). 

 Niagaran (Brownsport) : Near Clifton, Wayne County, Tennessee. 



ORMOSPIRA Grabau and Shimer. See Omospira Ulrich. 



ORTHIDIUM Hall and Clarke. Genotype: Orthis gemmicula Billings. 



Orthidium Hall and Clarke, Pal. New York, 8, pt. 1, 1892, p. 244; llth Ann. 

 Rep. New York State Geol., 1894, p. 276. Miller, N. A. Geol. Pal., 2d App., 

 1897, p. 762. 



Orthidium gemmicula (Billings). 



Orthis gemmicula Billings, Pal. Fossils, 1, Geol. Surv. Canada, 1865, p. 75, fig. 



68 (adv. sheets 1862). 

 Orthidium gemmicula Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 217, 



244, pi. 7A, figs. 22-25. 

 Ozarkian ? (Levis erratic): Point Levis, Quebec. 



Orthidium lamellosum Raymond. 



Orthidium lamellosa Raymond, Amer. Jour. Sci., 4th ser., 20, 1905, p. 371; Ann. 



Carnegie Mus., 7, 1911, p. 248, pi. 36, figs. 17, 18; fig. 24. 

 Chazyan (Crown Point, Valcour): Valcour and Sloop Islands, Chazy and Crown 



Point, New York. 



ORTHIS Dalman (emend. Hall and Clarke). Genotype: O. calligramma Dalman 

 Orthis Dalman, Kongl. Svenska Vet. Akad. Handl., 1828, pp. 93, 96. Hall and 

 Clarke, Pal. New York, 8, pt. 1, 1892, p. 192. Winchell and Schuchert, 

 Geol. Minnesota, 3, 1893, p. 417. Hall and Clarke, llth Ann. Rep. State 

 Geol. Surv., 1894, p. 265. Wysogorski, Zeit. d. d. geol. Gesell., 52, 1900, p. 

 225. Grabau, Bull. New York State Mus., 9, 1901, p. 185; Bull. Buffalo Soc. 

 Nat. Sci., 7, 1901, p. 185. Grabau and Shimer, N. A. Index Fossils, 1, 1907, 

 p. 250. Schuchert, Zittel-Eastman Textb. Pal., 1900, p. 319; 2d ed., 1913, 

 p. 381. 



Orthis of authors. 



Orthis Emmons, Amer. Geol., 1, pt. 2, 1855, p. 193. Billings, Canadian Nat. 

 Geol., 1, 1856, p. 133. Pictet,TraitedePal.,2ded.,4,1857,p.55. Chapman, 

 Canadian Jour., n. s., 3, 1858, p. 160; ibid., 7, 1862, p. 111. Hitchcock, Geol. 



