358 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Cyrtoceras vassarina Dwight. 



Cyrtoceras Vassarina Dwight, Amer. Jour. Sci. Arts, 3d ser., 27, 1884, p. 254, pL 



7, figs. 7, 7a, 8. 

 Canadian (Beekmantown): Rochdale, New York. 



Cyrtoceras vontricosum Miller. 



Cyrtoceras ventricosa Miller, Cincinnati Qnart. Joiir. Sci., 2, 1875, p. 131, fig. 



16.— James, J. F., Jour. Cincinnati Soc. Nat. HLst., 8, 1886, p. 246.— Miller, 



N. A. Geol. Pal., 1889, p. 435, fig. 731. 

 Eden (Southgate): Cincinnati, Ohio. 



Cyrtoceras whitneyi Hall. 



Cyrtoceras whitneyi Hall, Rep. Sup. Geol. Surv. Wisconsin, 1861, p. 39. — "Whit- 

 field, Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 65, pi. 9, fig. 5. 

 Richmond (Maquoketa): Maquoketa Creek, Iowa. 



Cyrtoceras(?) wlnonicum Sardeson. 



Cyrtoceras(?) winonicum Sardeson, Bull. Minnesota Acad. Nat. Sci., 4, 1896, 



p. 102, pi. 6, figs. 2, 3. 

 Ozarkian (Oneota) : Near Dreshach, Winona County, Minnesota. 



CTRTOCEBINA Billings. Genotype: C. typica Billings. 



Cyrtocerina Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 178. — Barrande, 

 Syst. Sil. Centre Boheme, 2, pt. 1, 1867, p. 451. — Hyatt, Proc. Boston Soc. 

 Nat. Hist., 22, 1884, p. 266.— Miller, N. A. Geol. Pal., 1889, p. 436.— Holm, 

 Geol. Foren. Stockholm Forenhandl., 14, 1892, pp. 126, 209.— Clarke, Geol. 

 Minnesota, 3, pt. 2, 1897, p. 774.— Hyatt, Zittel-Eastman Textb. Pal., 1, 

 1900, p. 517; 2d ed., 1913, p. 597. 



Cyrtocerina madisonensis (Miller). 



Tryblidium madisonense Miller, 18th Ann. Rep. Dep. Geol. Nat. Res. Indiana, 



1894, p. 318, pi. 9, fig. 38 (adv. sheets, 1892).— Cumings, 32d Ann. Rep. 



Dep. Geol. Nat. Res., Indiana, 1908, p. 977, pi. 39, fig. 10. 

 Cyrtocerina madisonensis Miller and Faber, Jour. Cincinnati Soc. Nat. Hist., 



17, 1894, p. 32.— Foerste, Bull. Sci. Lab. Denison Univ., 14, 1910, p. 74. 

 Richmond (Whitewater-Saluda) : Madison, Indiana. 



Cyrtocerina mercurius Billings. 



Cyrtocerina Mercurius Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 194, 



text fig. 179. 

 Canadian (Levis) : Point Levis, Quebec. 



Cyrtocerlna(?) schoolcraftl Clarke. 



Cyrtocerina(?) schoolcrafti Clarke, Geol. Minnesota, 3, pt. 2 1897 p. 774, pi. 47 



figs. 12-14. 

 Black River (Decorah): Near Cannon Falls, Minnesota. 

 Holotype: Cat. No. 46526, U.S.N. M. 



Cyrtocerina typica Billings. 



Cyrtocerina typica Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 178, text 



fig. 159.— Miller, N. A. Geol. Pal., 1889, p. 436, fig. 732. 

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



CTRTODONTA Billings. Genotype: C. rugosus and C. canadenso Billings. 



Cyrtodonta Billings, Geol. Surv. Canada, Rep. Progr. for 1857, 1858, p. 179; 



Canadian Nat. Geol., 3, 1858, p. 431; ibid., 4, 1859, p. 303; ibid., 6, 1861, p. 



353; ibid., 7, 1862, p. 392.— Meek and Worthen, Geol. Surv. Illinois, 3, 1868, 



p. 310.— Zittel, Handb. Pal., 2, 1881, p. 50.— Salter, Mem. Geol. Surv. Great 



