284 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bull 87. 



Oithis canalis Hall=Dalmanella elegantula. 



Oitliis carbonaria Swallow=liliipi(loiiiella pecosi. 



Ortbis carinata llall=Scbizopboria cariiiata. 



Orthis carleyi Hall=Dinortbis retrorsa. 



Orthis carausii Salter. Calciferous (Ord.). 



Orthis carausii (Salter, MS.) Davidson, Gnol. Mag. London, V, 1868, p. 315, pi. 



16, lig-. 23. 

 Ortbis carausii ? Matthew, Trans. Royal Soc. Canada, X, 1893, p. 102, pi. 7, lig. 7. 

 Loc. England ; near St. John, New Brunswick. 



Orthis (?) centrilineata HalL Lorraine (Ord.). 



Orthis centrilineata, Hall, Pal. New York, I, 1847, p. 289, pi. 79, fig. 5*. 

 Loc. Lorraine and Turin, New York. 



Ortbis ceiitrosa Miller =Platystropbia crassa. 



Ortbis cbarlotta" Wincbell=Dinortbis pectinella. 



Ortbis cinciiiuatieiisis Miller=()rtbis? pumila. 



Ortbis (?) circularis N. H. Winchell = l)aliiiauelbi subjuquata circularis. 



Ortbis circulus Hall=Rliipidomella circulus. 



Ortbis clarkeiisis Swallow=Rbipidomella clarkeiisis. 



Ortbis cleobis Hall=Kbipidoiiiella cleobis. 



Ortbis clytie Hall=Heterortbis clytie. 



Ortbis coloradoensis Meek, lS70 = Ortbis ? destnopleura. 



Ortbis coloradoeiisis Sbiimard = Billin8sella coloradoensis. 



Ortbis concinna Hall=Dalmauella concinna. 



Orthis (?) concinna Morris and Sbarpe. Lower Devonian. 



Orthis concinna Morris and Sharpe, Quart. Jour. Geol. Soc. London, II, 1840, p. 



275, pi. 10, fig. 2. 

 Loc. Falkland Islands. 

 01}8. Probably a species of Orthotbetes. 



Ortbis conradi Castelnaii = Hipparionyx proxinins. 



Ortbis conradi N, H. Wincbell = ])alman('lla siiba'quata conradi. 



Ortbis cooperensis Swallow=Rbipidoniella dubia. 



Ortbis cora d'Orbigny=Scbizopboria cora. 



Orthis corinna Billings. Calciferous (Ord.). 



Orthis corinna Billings, Pal. Fossils, I, 1865, p. 302, fig. 292. 

 Orthis ? corinna Hall and Clarke, Pal. New York, VIII, Pt. 1, 1892, p. 217. 

 Loc. Stanbridge, Quebec, Canada. 



Orthis corpulenta Sardeson=Dalmanella testudinaria meeki. 



Orthis costalis Hall. Cbazy (Ord.). 



Ortbis costalis Hall, Pal. Now York, I, 1847, p. 20, pi. 1 bis, lig. 4 ;— Second Ann. 



Kep. N. Y. State Geol., 1883, pi. 34, figs. 35-38.— Hall and Clarke, Pal. New 



York, VIII, Pt. I, 1892, pp. 221, 228, pi. 5, figs. 15-17. 

 Loc. Chazy, New York. 



Ortbis costata Hall (non Sowerby) = Ortbis i)uinila. 



Or til is crassa James =riatystropbia crassa. 



Ortbis crenistria Geinitz=Derbya crassa. 



Ortbis crispata Emmons = l)ahnanella crispata. 



Ortbis ciiniberlandia IIall = Kliipidomella cninbeiiandia. 



Ortbis cuneata Owen=libipidomella cuneata. 



