scHncHERT.l INDEX AND BIBLIOGRAPHY. 283 



Oithis aciitilinita Meek=Platystropliia acutilirata. 



Orthis acutiloba Riugueberg=Bilol)ites acutilobus. 



Ortbis alata Slialer=Ortbis davitlsoni. 



Ortbis alsus Hall^Kbipidouiella alsa. 



Orthis C?) alternans Castebiau. Formation.'? 



Orthis alteniaus Castelnan, Essai Syst. Sil. TAm^rique Septeutiiouale, 1843, p. 



38, pi. 14, fig. 2. 

 Loc. "From an erratic hlock. Lake of the Woods." Undetermiuable. 



Orthis amoena IST. H. Wiiicbell=Dabiiaiiella amoena. 

 Ortbis anticostieusis Sbaler=Diiiortbis porcata. 



Orthis (?) apicalis Bilbugs. ! Upper Cambrian. 



Orthis ? apicalis Billings, Pal. Fossils, I, 1865, p. 301, fig. 291.— Hall and Clarke, 



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

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



Ortbis aracbnoides Eoeraer and Hall (non Pbillips)=Derbya crassa. 



Ortliis arinanda BiIlings=Syntropbia arnianda. 



Ortbis assiinilis Hall=Kbipidoinellai assimilis. 



Ortbis aurelia Billings = Plectortbis anrelia. 



Ortbis aymara Salter=Anoplotbeca Habellites. 



Ortbis barabuensis Wincbell=Syntropbia barabuensis. 



Ortbis battis Billings=Hebertellabattis. 



Ortbis bellarugosa Conrad=Hebertella bellirngosa. 



Ortbis bellarngosa Hall, 1883=Hebertella iusculpta. 



Ortbis bellula Meek=Dalmanella bellula. 



Orthis benedicti Miller. Niagara (Sil.). 



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



13, figs. 7-9. 

 Loc. Hartsville, Indiana. 



Ortbis bicostatus Vanuxem=Reticnlaria bicostata. 



Ortbis bitbrata of authors =Platystropbia biforata. 



Ortbis biforata acutilirata White =Platystrophia acutilirata. 



Orthis billingsi Hartt=Billingsella billiugsi. 



Ortbis biloba Hall=Bilobites bilobns. 



Ortbis bisulcata Emmons=Oyclospira bisulcata. 



Ortbis borealis Binings=Hebertella boiealis. 



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



Orthis buchi d'Orbigny, Voyage dans FAm^rique M^ridionale, Pal., 1842, p. 49. 

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



Animaux Foss., Pt. 1, 1847, p. 238. 

 Loc. Yarbicharabi, Bolivia. 



Ortbis calligramma Foerste (non Dalmau)=Ortbis flabellites. 



Ortbis calligramma davidsoni Nicholson and Hinde=Orthis davidsoni. 



Orthis calligramma Kayser. Lower Ordovician. 



Orthis calligramma Kayser (non Davidson), Palseontographica, Snppl., Ill, 1876, 



pp. 18, 26, pi. 3, figs. 9-18. 

 Loc. Cordillere San .Jnan, Argentine Republic. 

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



calligramma. 



