894 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Orthis menapiae Hicks. 



OrtMs menapiae (Hicks MS.) Davidson, Geol. Mag. London, 5, 1868, p. 314, pi. 



16, figs. 24-28. Matthew, Trans. Royal Soc. Canada, 10, 1893, p. 101, pi. 7, 



figs. 2-6. 

 Lower Ordovician: England; near St. Johns, New Brunswick (Bretonian 



Div. C3d). 



ORTHIS MEROPE Billings. See Scenidium? merope. 



Orthis(?) minna Billings. 



Orthis minna Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 303, fig. 294. 

 Canadian (Beekmantown) : Stanbridge, Quebec. 



ORTHIS MINNEAPOLIS N. H. Winchell. See Pianodema subsequata. 

 ORTHIS MINNESOTENSIS Sardeson. See Dinorthis meedsi. 

 ORTHIS MISSOURIENSIS Shumard. See Schuchertella missouriensis. 

 ORTHIS(?) MORROWENSIS James. See Platystrophia morrowensis. 

 ORTHIS MULTISECTA Sardeson. See Dalmanella multisecta. 



Orthls(?) ihycale Billings. 



Orthis Mycale Billings, Pal. Fossils, 1, 1865, p. 82, text fig. 75 (Adv. sheets, 



1862), Hall and Clarke, Pal. New York, 8, pt. 1, 1892, p. 217, pi. 7A, figs. 



10, 11. 

 Ozarkian? (Levis-erratics): Point Levis, Quebec. 



ORTHIS NEGLECTA James. Sej3 Plectorthis neglecta. 



Orthis nettelrothi Foerste. 



Orthis flabellulum Nettelroth, Kentucky Fossil Shells, Mem. Kentucky Geol. 



Surv., 1889, p. 38, pi. 34, fig. 30. 



Orthis nettelrothi Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 76. 

 Niagaran (Louisville) : Louisville, Kentucky. 



ORTHIS NEWTONENSIS Weller. See Eoorthis newtonensis. 



ORTHIS NISIS Hall and Whitfield. See Orthostrophia (Schizoramma) nisis. 



Orthis nitens Vanuxem. Nat recognized. 



Orthis nitens Vanuxem, Nat. Hist. New York Geol., 3, 1842, p. 90. 

 Clinton: New York. 



ORTHIS OBLATA EMARGINATA Hall. See Rhipidomella emarginata. 



Orthis obtusa Pander. 



Orthis obtusa (Pander) Kayser, Palseontographica, Suppl., 3, 1876, p. 19, pi. 3, 



figs. 1, 2. 

 Ordovician: Europe; Cordillere San Juan, Argentina. 



ORTHIS OCCIDENTALIS of authors. See Hebertella occidentalis and H. alveata. 

 ORTHIS OCCIDENTALIS var. SINUATA Meek. See Hebertella occidentalis sinuata. 

 ORTHIS ORBICULARIS Sowerby. See Dalmanella lunata. 

 ORTHIS ORTHAMBONITES Billings. See Orthis panderiana. 



