scHurHEHT.] INDEX AND BIBLIOGRAPHY. 277 



Oi'biciila cornigata Hall=Licbena.lia, a bryozoaii. 



Orbicula crassa Iiall = ()bolella crassa. 



Orbicula deforinata Ilall=Crauia defonuata. 



? Orbicula excentrica Emmons. Cambrian. 



Orbicula excoiitrica Kinmons, American Geology, Pt. II, 1855, }». 112, jil. 1, tig. 4. 

 Crania excentrica Miller, \. American Oeol. Pal., 188St, p. 341. 

 Loc, Angusta County, Virginia. 

 Ohs. Probably a gastropod. 



Orbicubi tilosa llall = Sf*bizooraiiia filosa. 



Orbicubi grandis Vanuxeni = l\a'inerella g'randis. 



Orbicubi bimellosa Tlall (noii liroderip)=Orbiculoidea lamellosa. 



Orbicnla lode.nsis Vanuxem = ()rbiculoidea lodiensis. 



Orbicubi higubris Conrad = l)isciuisca lugubris. 



Orbicubi uiinuta Hall = Orbical()idea minuta. 



Orbicubi multibneata Conrad = Discinisca multibneata. 



Orbicula parmulata Uall=Orbiculoidea parinulata. 



Orbicula prima Owen=Lingulepis pinniformis. 



Orbicula squamiformis Hall=Pbolidops squamiformis. 



Orbicula subtruncata Hali=Pbolidops subtruncata. 



Orbicula tenuilamellata IIan = Scliizotreta tenuilamellata. 



Orbicula terminalis p]mnions=Treinatis terminalis. 



Orbicula truncata Emnions=Orbiculoidea lamellosa. 



ORBICTJLOIDEA d'Orbigny. Cenotype Orbicula morrisi Davidson. 



Orbicnloidea d'Orbigny, Prodrome de Pal<?ontologie stratigraphiqne, I, 1850, p. 

 44.— Dall, Bull. Mns. Comp. Zool., Ill, 1871, p. 37;— American ,Jonr. Conch., 

 VII, 1871, p. 74.— Herrick, Bull. Denison Univ., IV, 1888, p. 12.— Hall and 

 Clarke, Pal. Xew York, VIII, Pt. I, 1892, p. 125, iig. 64; p. 128, lig. 160 and 

 pp. 160, 168. — Wiucliell and Schnchert, Minnesota Geol. Snrvey, III, 1893, 

 p. 363.— Hall and Clarke, Eleventh Ann. Rep. N. Y. State Geologist, 1894, 

 p. 256. 



Discina Hall (uon Lamarck), Pal. New York, III, 1859, p. 159; — Sixteenth Rep. 

 N. Y. State Cab, Nat. Hist., 1863, p. 130;— Pal. New York, IV, 1867, p. 15. 



Orbiculoidea alleghania (Hall). Chemung (Dev.). 



Discina alleghania Hall, Thirteenth Rep. N. Y. State Cab. Nat. Hist., 1860, p. 



77, tigs. 1, 2;— Pal. New York, IV, 1867, p. 25, fig. 1, pi. 1, fig. 17. 

 Loc. Hobbieville, Alleghany County, New York. 



Orbiculoidea ampla Hall. Oriskany (Dev.). 



Discina grandia Hall (uon Vanuxem, 1842), Pal. New York, III, 1859, p. 406, pi. 



92, fig. 1. 

 Discina amjda Hall, Ibidem, corrigenda in volume with plates, 1859. 

 Orbiculoidea ampla Hall and Clarke, Pal. New Y'ork, VIII, Pt. I, 1892, p. 127. 

 Loc. Albany County, New York ; Cayuga, Ontario. 



Orbiculoidea baini (Morris and Sbarpe.) Middle Devonian. 



Orbicula baini Morris and Sharpe, Quart. Jour. Geol. Soc. London, II, 1846, p. 



277, pi. 10, fig. 5. — Sharpe and Salter, Traua. Geol. Soc. Loudon, 2d ser., VII, 



1856, p. 210, pi. 26, ligs. 20-23. 

 Discina baini von Amnion, Zeita. Geaaels. fiir Erdk., Berlin, XXVIII, 1893, p. 



359, fig. 4. 

 Loc. Falkland Islands; Taquarassu, MattoGrosso, Brazil; South Africa. 



