352 BULLETIN 92, UNITED STATES NATION.VL MUSEUM. 



Cyrtoceras engium Hall. 



CjTtoceias euguini HaJl, Rep. Geol. Surv. Wiaconsin, 1861, p. 40. — Whitfield, 



Mem. Amcr. Mus. Nat. Hist., 1, pt. 2, 1896, p. 66, pi. 9, figs. .3, 4. 

 Black River (Platteville): Beloit, Wiscousiu. 



Cyutoceras EXiGi;uM Billings. See Oncoceras exigiium. 



Cyrtoceras faberi J. J'\ James. 



Cyrtoceras faberi James, J. F., Jour. Cincinnati Son. Xat. Hist., 8, 1886, p. 246, 



pi. 4, figs. 3a, b. 

 Richmond: Waynes\dlle, Ohio. 



Cyrtoceras falx Billings. See Maelonoconis falx. 



Cyrtoceras feathei\stonhaughi Clark*'. 



Cyrtoceras featherstonhaughi Clarke, Geol. I^Iiunesota, 3, pt. 2, 1897, p. 807. pi. 58, 



figs. 12-1.5. 

 Black River (Platteville): Cannon Falls, Minnesota. 



Cyrtoceras fllosum (Conrad). 



Cyrtoceras filosum (Conrad M. S.) Emmons, Nat. Hist. New York Geol., 2, 1842, 



p. 392, fig. 4.— Owen, Amer. Jour. Sci. Arts, 47, 1844, p. 369, fig. 4 on p. 365.— 



D'Orbigny, Prodr. de Pal., 1, 1849, p. 2. — Lesley, Geol. Surv\ Pennsylvania, 



Rep. P 4,' 1889, p. 181, fig. 

 Cyrtolites filosum Hall, Pal. New York, 1, 1847, p. 190, pi. 41, figs. 3a, b.— 



Emmons, Amer. Geology, 1, pt. 2, 1855, p. 167, pi. 12, fig. 4; Man. Geol., 



1860, p. 98, fig. 87. 

 Trenton: WatertoAvn, New York. 



Cyrtoceras josteri Hall. See Cyrtorizoceraa fosteri. 



Cyrtoceras fragile Billings. See Oncoceras fragile. 



Cyrtoceras fultonensis Meek and Worthen. See Cyrtorizoceras dardanum. 



Cyrtoceras giganteum McChesney. See Nautilus?? cancellatus. 



Cyrtoceras gracile Cleland. 



Cyrtoceras sp. Cleland, Amer. Pal., 3, Bull. 13, 1900, p. 19, pi. 17, figs. 5, 6. 

 Cyrtoceras gracilis Cleland, Bull. Amer. Pal., 4, 1903, p. 13, pi. 3, fig. 11. 

 Canadian (Tribes Hill) : Fort Hunter, Tribes Hill, and Canajoharie, New York. 



Cyrtoceras halleanus D'Orbigny. See Zitelloceras hallianuni. 



Cyrtoceras hercules Hall. See Protophragmoceras hercules. 



Cyrtoceras Hertzeri Hall and 'WTiitiield. See Hexameroceras hertzeri. 



Cyrtoceras hitzl Foerste. 



Cyrtoceras hit zi Foerste, Bull. Sci. Lab. Denison l"ui\., IG. 1910, p. 78, pi. 1, 



fig. 7a, b; pi. 2, fig.s. 23a-c. 

 Richmond (Whitewater-Saluda) : Madison, Indiana. 



Cyrtoceras houghtoni Clarke. 



Cyrtoceras houghtoni Clarke, Geol. Minnesota, 3, pt. 2, 1897, ]\ 807, pi. 59, figf. 



12-15. 

 Black River (Platteville): Cannon Falls, Minnesota. 



Cyrtoceras howardl Miller. 



CjTtoceras howardi Miller, 18th Ann. Rep. Dep. Geol. Nat. Res. Indiana. 1894. 



p. 323, pi. 12, fig. 1; adv. sheets, 1S92, p. 69, pi. 12, fig. 1. 

 Niagaran (Laurel): St. Paul, Indiana. 



