srHuciiERT.) INDEX AND BIBLIOGRAPHY. 283 



Orthis acutilinitsi ]Meek=PhitystropIiiii acutilirata. 



Ortbis acntiloba Ringaebers:=Bil()l)ites acutilobus. 



Orthis alata Slialer=()rthis davidsoni. 



Orthis alsus Uall=lihii)idomella alsa. 



Orthis (?) alternans Casteliuiu. Formation.'? 



Ortliis altenians Castclnau, Essai Syst. Sil. I'Aiu^riquo Kei)teutiionale, 1843, p. 



38, pi. 11, liJ,^ 2. 

 Loc. " I''rom an erratic block, Lake of (lie Woods." Undcteruiiuable. 



Orthis aina3iia N. H. Wiiichell=Dabiiaiiella aiucena. 

 Ortliis aiiticostiensis Shaler=Diiiorthis porcata. 



Orthis (1) apicalis IMllings. ? Upper Cambrian. 



Orthis? apicalis nilling.s, Pal. Fossils, I, 186.'^, p. 301, tig. 291.— Hall aud Clarke, 



Pal. New York, VIII, Pt. I, 1892, p. 217. 

 Loc. Poiut Levis and west end of Island of Orleans, Canada. 



Ortbis aracbnoides I^oenier and Hall (non Phillips) =Uerby a crassa. 



Ortbis arnianda Billin«;s=Syutropbia arnianda. 



Ortbis assimilis Hall = Khipidomella assimilis. 



Ortbis aurelia Billings = Plectortbis aurelia. 



Ortbis aynuira Salter=Anoplotbeca llabellites. 



Ortbis barabueusis Wincbell=Syntropbia barabuensis. 



Orthis battis Billings = Hebertellabattis. 



Ortbis bellarugosa Conrad =nebertella. bellirugosa. 



Ortbis bellarugosa Hall, 1883=nebertella iusculpta. 



Ortbis bellula Meek = Dalmanella bellula. 



Orthis henedicti Miller. iS^iagara (Sil.). 



Orthis beuedicti Miller, .Seventeenth Rep. State Geol. Indiana, 1891, p. 78, pi. 



13, figs. 7-9. 

 Loc. Hartsville, Indiana. 



Orthis bicostatus Vanuxem=Eeticularia bicostata. 



Ortbis bitbrata of autbors=Platystrophia biforata. 



Orthis biforata acutilirata White =Platystrophia acutilirata. 



Orthis billingsi Hartt=Billingsella billingsi. 



Orthis biloba nall = Bilobites bilobus, 



Orthis bisulcata Eniinons=Cyclospira bisulcata. 



Orthis borealis Billings=Hebertella borealis. 



Orthis(?) huchi d'Orbigny. Upper Carboniferous. 



Orthis bucbi d'Orbigiiy, Voyage dans FAni^rique M^ridionale, Pal., 1842, p. 49. 

 Productus audii d'Orbigny, Ibidem, p. 54, pi. 5, figs. 1-3. — de Koniuck, Recher. 



Aiiimaux Foss., Pt. I, 1847, p. 238. 

 Loc. Yarbicbanibi, Bolivia. 



Orthis calligranima Foerste (non Dalmau)= Orthis flabellites. 



Orthis calligramma davidsoni Nicholson and Hinde=Orthis davidsoni. 



Orthis calligramma Kayser. Lower Ordovician. 



Orthis calligraniiiia Kayser (non Davidson), Paheontographica, Suppl., Ill, 1876, 



pp. 18, 2fi, pi. 3, figs. 9-18. 

 Loc. Cordillero San .Juan, Argentine Republic. 

 Ohs. These shells appear to be more closely related to O. plicatella than to O. 



calligramma. 



