BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 355 



CYKTOCKKAH .MVKK i<; Hall and Whitfield. See Kionoceras darwini. 



Cyrtoccras nashvillense Miller. 



( ' yrl.oceras nashvillensis Miller, 17th Ann. Rep. Dep. Geol. Nat. Res. Indiana, p. 



697, pi. 16, fig. 1 ; adv. sheets, 1891, p. 87. 

 Xia-raran (Osgood or Laurel): West of Nashville, Tennessee. 



CYRTOCERAS NELEUS Hall. See Ma^lonoeeraH nel'-us. 



Cyrtoceras norwoodi ( 'larkr. 



Cyrtoceras norwoodi Clarke, Geol. Minnesota. :!, pt. 2, 1897, p. 809, pi. 60, figs. 



7-9. 

 Black River (Platteville) : Rockton, Illinois. 



( ' v KT< x K if A s OBSCURA Miller. See Cyrtoceras niagister. 

 ('YI;T<>CKI:AS OKCAS Hall. See Oncoceraa orcaa. 



Cyrtoceras orestes Billings. 



ryrioreras Orestes Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 177. 

 Upper Medinan (Cataract): West Flamborotigh, Ontario. 



CYRTOCERAS ORODES Billings. See Cyclostomiceras erodes. 



CVRTOCEHAS PLANODORSATUM Whitfield. See Tripteroceras planodorsatuni. 



Cyrtoceras postumius Billings. 



Cyrtoceras Postumius Billings, Pal. Foss, 1, Geol. Surv. Canada, 1865, p. 178. 

 Richmond: Cape Smyth, Manitoulin Island, Lake Huron. 



Cyrtoceras pusillum Hall. 



Cyrtoceras pusillum Hall, 20th Rep. New York State Cab. Nat. Hist., 1868, p. 357; 



rev. ed., 1870, p. 407. 

 Niagarau (Racine): Racine, Wisconsin. 



Cyrtoceras quebecense Whiteaves. 



Cyrtoceras Quebecense Whiteaves, Ottawa Nat., 12, 1898, p. 120; Geol. Surv. 



Canada, Pal. Foss., 3, pt. 4, 1906, p. 315, pi. 35, figs. 1, la. 

 Canadian (Levis limestone): Point Levis, Quebec. 



CYRTOCERAS RAEI Whitfield. See Ooceras? raei. 



Cyrtoceras rectum Whitfield.' 



Cyrtoceras rectum Whitfield, Ann. Rep. for 1877, 1878, p. 85; Geol. Wisconsin, 4, 



1882, p. 319, pi. 24, figs. 6, 8. 

 Niagaran (Guelph): Carl ton, Wisconsin. 



Cyrtoceras regulare Billings. 



Cyrtoceras regulare Billings, Geol. Surv. Canada, Rep. Progr. for 1853-56, 1857, p. 



314. 

 Black River (Leray) : Pauquettes Rapids, Ottawa River, Canada. 



Cyrtoceras reversum Spencer. Not recognized. 



Cyrtoceras reversum Spencer, Bull. Missouri State Mus., 8, 1884, p. 60, pi. 7, 

 fig. 8; Trans. Acad. Sci. St. Louis, 4, 1884, p. 610, pi. 7, fig. 8. Clarke and 

 Ruedemann, Mem. New York State Mus., 5, 1903, p. 96. 

 Xiagaran (Lockport): Limehouse Station, Ontario. 



Observation. Cast of the living chamber probably of Poterioceras sauridens 

 Clarke and Ruedemann, figured in a reversed position. 



