458 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DISCINA TRUNCATA Emmons. See Orbiculoidea lamellosa. 

 DISCINA VANUXEMI Hall. See Orbiculoidea vanuxemi. 



DISCOCERAS Barrande. Genotype: Clymenia antiquissima Eichwald. 



.Discoceras Barrande, Cephalopodes; Ext. Syst. Sil. du Centre Boheme, 1877, p. 

 95. Angelin, Fragmenta Silurica, 1880, p. 9. Zittel, Handb. Pal., 2, 1884, 

 p. 377. Remele, Zeits. d. d. geol. Gesell., 28, 1886, p. 468. Schroder, Pal. 

 Abhandl. von Dames u. Kayser, Neue Folge, 1, Heft. 4, Jena, 1891, p. 20. 

 Hyatt, Proc. Amer. Phil. Soc., 32, 1894, p. 500. Koken, Die Leitfossilien, 

 Leipzig, 1896, p. 51. Miller, N. A.Geol. Pal., 2d, App., 1897, p. 772. Grabau 

 and Shimer, N. A. Index Fossils, 2, 1910, p. 72. 



Discoceras canadense Whiteaves. 



Discoceras Canadense Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 3, 1897, 



p. 227, pi. 22, figs. 3, 3a. 

 Black River or Richmond: Little Black Island; Lake Winnipeg, Canada. 



DISCOCERAS EATONI Schroeder. See Schroederoceras eatoni. 



Discoceras graftonense (Meek and Worthen). 



Lituites Graftonensis Meek and Worthen, Proc. Acad. Nat. Sci. Philadelphia, 



1870, p. 51; Geol. Surv. Illinois, 6, 1875, p. 507, pi. 25, fig. 1. Newell, Proc. 



Boston Soc. Nat. Hist., 1888, 23, p. 485 (loc. occ.). Whiteaves, Pal. Foss., 



Geol. Surv. Canada, 3, pt. 2, 1895, p. 105. Grabau and Shimer, N. A. Index 



Fossils, 2, 1910, p. 72. 

 Lituites multicostatus Whitfield, Ann. Rep. for 1879, 1880, p. 67; Geol. Wisconsin, 



4, 1882, p. 303, pi. 20, fig. 7. Newell, Proc. Boston Soc. Nat. Hist., 23, 1888, 



p. 486 (loc. occ.). 

 Trocholites multicostatus Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 1, 



1884, p. 36, pi. 6, figs. 1, la. Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 



1890, p. 1229, figs. 

 Niagaran: Grafton, Illinois; Waukesha, Wisconsin; Indiana; Elora and Hespeler, 



Ontario (Guelph). 



DISCOCERAS INTERNISTRIATUM Schroeder. See Trocholites internistriatus. 



Discoceras marshi (Hall). 



Lituites marshii Hall, 20th Rep. New York State Cab. Nat. Hist., 1868, p. 362- 

 pl. 16(7), figs. 6, 7; rev. ed., 1870, p. 404, pi. 16, figs. 6, 7 Nettelroth, Ken, 

 tucky Foss. Shells, Geol. Surv. Kentucky, 1889, p. 195, pi. 30, fig. 1. Kindle 

 and Breger, 28th Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1904, p. 473, pi. 

 21, fig. 4. 



Discoceras marshii Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 72, fig. 

 1284. 



Niagaran: Kankakee, Illinois; Louisville, Kentucky; Wabash, Indiana. 



Plesiotype Cat. No. 51378, U.S.N.M. 



Discoceras ortoni (Meek). 



Lituites? Ortoni Meek, Geol. Surv. Ohio, Pal., 1, 1873, p. 186, pi. 15, fig. 4 



(Gyroceras? Ortoni at end of description). 



Discoceras ortoni Miller, N. A. Geol. Pal., 2d App., 1897, p. 773 (gen. ref.). 

 Niagaran (Guelph): Greenville, Darke County, Ohio. 



DISCOLITES Emmons. See Microceras Hall. 



DISCOLITES MINUTUS Emmons. See Microceras inornatum. 



