scHfciiERT] INDEX AND BIBLIOGRAPHY. 285 



Oithis cyclas Hall=lvbipi(lomellii cycliis. 



Ortliis cycliis Jaiiies = Dalinaiiellii testudinaria emacerata. 



Ortbis cyplia Janies=]*latystr{)pliia laticosta. 



Ortliis dalyana ]Miller=RbipidoineIla dalyaua. 



Orthis davidsoni de Verneuil. Anticosti and Niagara (Sil.). 



Ortliis davidsoni de Venioiiil, Hull. .Sof. Gi-ol. do Franco, 2d Her., V, 1848, p. 341, 

 pi. 4, fig. 9.— Billings, Gcol. Canada, 18Go, p. 312, tig. 318.— Hall and Clarke, 

 Pal. Now York, VII 1, Ft. I, 1892, pp. 192, 193, 221, 228, pi. 5, lige. 5-8. 



Ortliis alata Slialer, Bull. Mus. Conip. Zool., 4, 1865, p. fiG. 



Orthis calligramma var. davidsoni Nicholson and Hinde, Canadian .Jonr., n. ser., 

 XIV, 1874, p. 144.— Nicholson, Pal. Prov. Ontario, 1875, p. 47, fig. 21g. 



Loc. Europe; Anticosti; Dundas, Ontario. 



Ortbis daytonensis Foerste=Hebertella daytoiiensis. 

 Ortbis detbrmis nall = Ortbotbetes deformis. 



Orthis (?) delicatula Billings. ? Oalcif'erous (Ord.). 



Orthis delicatula Billings, Pal. Fossils, I, 1865, p. 217. 

 I.oc. Pistolet Bay and near Portland Creek, Newfoundland. 



Ortbis dentata Meek (non rauder)=Platystropbia crassa. 



Orthis (?) desmopleura Meek. Calciferous (Ord.). 



Orthis coloradoensis Meek (non Shumard), Proc. American Phil. Soc, II, 1870, 



p. 425. 

 Orthis desmopleura Meek, Haj'den's U. 8. Geol. Survey Wyoming, 1872, p. 295. 

 Loc. Colorado City and Manitoii, Colorado. 



Ortbis dicbotoma Hall=P]ectortbis dicbotoma. 

 Ortbis discus Hall=Rbipidomella discus. 

 Ortbis disparilis Conrad = Ortbis triceuaria. 

 Ortbis disparilis Owen=Dalmanella testudinaria. 



Orthis disparilis Kayser. Ordovician. 



Orthis disparilis Kayser (non Conrad), Paheontographica, Suppl., Ill, 1876, p. 



26, pi. 3, figs. 4-8. 

 Loc. Potrero de los Angulos, etc., Argentine Republic. 

 Ohs. Probably a new species. 



Ortbis dubia Hall=Rbipidomella dubia. 



Ortbis eboracensis Miller=Dalinanella lenticularis. 



Ortbis electra Billings=Dalmanella electra. 



Ortbis elegantula Dalman=DalinaneIla elegantula. 



Ortbis elegantula parva Foerste=Dalnianella elegantula parva. 



Ortbis ella Hall=Plectortbis ella. 



Ortbis emacerata Hall=DalmaiielIa testudinaria emacerata. 



Ortbis emacerata Meek (non Hall) = Dalnianella testudinaria meeki. 



Ortbis emarginata Hall=Rbipidomella oblata emarginata. 



Ortbis eminens Hall=Ebipidomella eminens. 



Ortbis erratica Hall=Catazyga erratica. 



Orthis (?) eryna Hall. Oorniferous (Dev.). 



Orthis icquivalvis Hall (non Hall, 1847), Tenth Rep. New York State Cab. Nat. 



Hist., 1857, p. 109. 

 Orthis eryna Hall, Sixteenth Rep. Ibidem, 1863, p. 35;— Pal. New York, l\, 1867, 



corrigenda. 

 Orthis idas Hall, Pal. Now York, IV, 1867, p. 42, pi. 5, fig. 11. 

 Loc. Williamsville, New York. 

 068. Possibly a species of Hippariouyx. 



