574 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Gyroceras duplicostatum "Whitfield. 



Gyroceras duplicostatum Whitfield, Ann. Rep. Geol. Surv. Wisconsin for 1877, 



1878, p. 78; Geol. Wisconsin, 4, 1882, p. 235, pi. 7, fig. 1.— Chamberlin, Geol. 



Wisconsin, 1, 1883, p. 159, fig.— Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 811. 

 Black River (Platteville): Beloit, Janesville, etc., Wisconsin. 



Gyroceras elrodi White. 



Gyroceras elrodi White, 11th Ann. Rep. Indiana Dep. Geol. Nat. Hist., 1882, p. 



356, pi. 37, fig. 1; pi. 38, figs. 2-4.— Lesley, Geol. Surv. Pennsylvania, Rep. 



P 4. 1889, p. 268, figs. 

 Barrandeoceras elrodi Miller, N. A. Geol. Pal., 2d App., 1897, p. 771 (gen. ref.). 

 Niagaran (Laurel): Hartsville, Indiana. 



Gyroceras farciinen Clarke and Ruedemann. 



Gyroceras farcimen Clarke and Ruedemann, Mem. New York State Mus., 5, 1903, 

 • p. 92, pi. 18, figs. 1^. 

 Niagaran (Guelph): Shelby, New York. 



Gyroceras hercules Chamberlin. See Protophragmoceras hercules. 



Gyroceras (Lituites) magnificum Billings. See Apsidoceraa magnificum. 



Gyroceras paradoxicum Hall. See Orthoceras paradoxicum. 



Gyroceras rhombolineare Owen. Not recognized. 



Gyroceras rhombolinearis Owen, Geol. Surv. Indiana, 1862, p. 362, fig. 4. 

 Silurian: Locality not given. 



Gyroceras (Lituites) vagrans Billings. See Barrandeoceras vagrans. 



GTRONEMA Ulrich. Genotype: G. pulchellum Ulrich and Scofield. 



Gyronema (subgenus of Trochonema) Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 

 1054.— Koken, Neues Jahrb. f. Min., Geol. Pal., 1, 1898, p. 24. 



Gyronema brevLspira Whiteaves. 



Gyronema brevispira Whiteaves, Geol. Surv. Canada, Ann. Rep., n. a., 14, 1904, 



App. F, p. 51; Geol. Surv. Canada, Pal. Foss., 3, pt. 4, 1906, p. 259, pi. 29, 



fig. 4. 

 Niagaran: Ekwan River, Canada. 



Gyronema dowlingi WTiitoaves. 



Gyronema Dowlingii Whiteaves, Geol. Surv. Canada, Ann. Rep., n. s., 14, Ajjp. 

 F, 1904, p. 50; Geol. Surv. Canada, Pal. Foss., 3, pt. 4, 1906, p. 259, pi. 

 29, fig. 3. 

 Niagaran: Ekwan River, Canada. 



Gyronema duplicatum Ulrich and Scofield. 



Gyronema duplicatum Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 



1055, pi. 78, figs. 22-25. 

 Trochonema (Gyronema) duplicatum Grabau and Shimer, N. A. Index Fossils, 1, 



1909, p. 671, fig. 928g, h. 

 Black River (Platteville): Beloit, etc., W^isconsin; Dixon, Illinois. 

 Cotype— Cat. No. 45823, U.S.N.M. 



Gyronema historlcum (Hudson). 



Eunema historicum Hudson, Bull. New York State Mus., 80, 1905, p. 288, pi. 4, 



fig. 5. 

 Gyronema historicum Raymond, Ann. Carnegie Mus., 4, 1908, p. 208, pi. 54, 



figs. 5, G. 

 Cyclonema? norinaliana Raymond, Amer. Jour. Sci., 4th Scr., 20, 1905, p. 377. 

 Chazyan (Valcour): Valcour Island and Plattsburg, New York. 



