200 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. fBnix.87. 



Ortliis o))lata eiiuirginata Hall^Khipidomella oblata emarginata. 

 Orthis obtusa Pander. Ordovician. 



Orthis obtusa (Pander) Kayser, Pala'outographica, Suppl., Ill, 1876, p. 19, pi. 3, 



r.gs. 1,2. 



Loc. Europe ; Cordillere San Juan, Argentine Republic. 

 Ortliis occasus Hall=Rliipidomella occasus. 

 Orthis occidentalis Hall = Hebertella occidentalis. 

 Ortliis orthambonites Billings=0. paiideriana. 

 Orthis palmata Sharpo and Salter =Auoplotheca llabellites. 

 Orthis pandcriana Mall and Clarke. Calciferons (Ord.). 



Ortbi.s ortharabouites Billing.s (non Murcbison and de Verneuil), Pal. Fossils, I, 

 1862, p. 77, fig. 70;— Geol. Canada, 1863, p. 231, fig. 245.— Scbucbort, Ninth 

 Ann. Rep. N. Y. State Geol., 1890, p. 43.— Hall and Clarke, Pal. New York, 

 VIII, Pt. I, 1892, pp. 221, 228, pi. 5, figs. 1-3.— Matthew, Trans. Royal Soc. 

 Canada, X, 1893, p. 101, pi. 7, fig. 4. 



Orthis panderiana Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, pi. 5, 

 footnote. 



Loc. Point Levis and St. John, Canada. 



Orthis parva de Verneuil = Dal man ella elegantula. 

 Ortliis pecosi Marcou=Rhipidomella pecosi. 



Orthis (?) pectinata d'Orbigny. Devonian. 



Orthis pectiuatus d'Orbigny, Voyage dans TAmdrique M6ridionaIe, Pal., 1842, 



p. 39. 

 Spirifer pectinatus d'Orbigny, Ibidem, 1842, pi. 2, figs. 13-15. 

 Loc. Lake Titicaca, Bolivia. 

 Ohs. Probably a species of Orthothetes. 



Orthis pectinella Emmons =Dinortliis pectinella. 



Orthis pectinella Whitfield, 1882=Plectorthis whitfieldi. 



Orthis pectinella semiovalis Hall=Dinorthis pectinella. 



Orthis peduncularis Hall=Scliizophoria peduncularis. 



Ortliis peloris nall=Rhipidoraella peloris. 



Orthis penelope Hall=Rhipidoinella penelope. 



Orthis penniana Derby = Rhipidoni ella penniana. 



Orthis pennsylvanica Simpson =Rhipidomella pennsylvanica. 



Orthis pepina Hall=Billingsella coloradoensis. 



Orthis perelegans Hall=Dalmanella perelegans. 



Orthis perversa Hall = Orthothetes chemungensis perversus. 



Orthis perveta Conrad =Dalmanella snba'quata pervetus. 



Orthis perveta Hall, 18S3=Dalmanella subsequata. 



Orthis petra' Sardeson=Diiiorthis proavita. 



Orthis ( 1') pigra Billings. Chazy (Ord.). 



Orthis piger Billings, Canadian Nat. Geol., IV, 1859, p. 442. 



Loc. Mingan Island. 



Ohs. This species is probably congeneric with Billingsella grandieva. 



Orthis pisum Hall (non Murchison)=Nucleospira pisiformis. 

 Orthis plana Castelnau (non ran(lei) = lvalines(iuina alternata. 

 Orthis planoconvexa Hall = Dalnian('lla i)l:iniconvexa. 

 Orthis platj's Billings=l)inortliis platys. 

 Orthis plicata Vanuxem= Spirifer vanuxemi. 



