546 BULLETIN 92^ UNITED STATES NATIONAL MUSEUM. 



Gazacriuus minor Weller. 



Gazacrinus minor Weller, Bull. Chicago Acad. Sci., Nat. Hist. Siirv., 4, pt. 1, 



1900, p. 80, pi. 3, figs. 3, 4. 

 Niagaran (Racine): Bridgeport, Illinois. 



Gazacriuus ventrlcosus (Wachemuth and Springer). 



Idiocrinus ventricosus Wachsmuth and Springer, Amer. Geol., 10, 1892, p. 137; 



Mem. Mus. Comp. Zool. Harvard, 20, 1897, p. 205, pi. 18, fig. 9a, b. 

 Gazacrinus ventricosus Bather, Treatise on Zool., pt. 3, Echinoderma, London, 



1900, p. 188, fig. 

 Niagaran (Laurel): St. Paul, Shelby County, Indiana. 



Geinitzella Waagen and Wentzel. See Batostomella Uhich, 



GEISONOCERAS Hyatt. Genotype: Orthoceras rivale Barrande. 



Geisonoceras Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 275; Zittel-Eastman 

 Textb. Pal., 1, 1900, p. 518; ibid., 2d ed., 1913, p. 598. 



Geisonoceras shumardi (Billings). 



Orthoceras shumardi Billings, Can. Nat. Geol., 4, 1859, p. 460, fig. 36. 

 Geisonoceras shumardi Ruedemann, Bxill. New York State Mus., 90, 1906, p. 437, 



pi. 12, fig. 4. 

 Orthoceras (Geisonoceras) shumardi Grabau and Shimer, N. A. Index Fossils, 2, 



1910, p. 48. 

 Chazyan: Mingan Islands, Canada (Mingan); Chazy, New York (Day Point, 



Crown Point). 



Geocrinus D'Orbigny. See Periechocrinus Austin. 



GERASAPHES Clarke. Genotype: G. ulrichana Clarke. 



Gerasaphes Clarke, Geol. Minnesota, 3, pt. 2, 1894, p. 710. 



Gerasaphes ulrichana Clarke. 



Gerasaphes ulrichana Clarke, Geol. Minnesota, 3, pt. 2, 1894, p. 710, figs. 14-16. — 



Miller, N. A. Geol. Pal., 2d App., 1897, p. 788.— Ruedemann, Bull. New 



York State Mus., 49, 1906, p. 60. 

 Trenton (Upper): Mouth of Licking River, Covington, Kentucky. 

 Eolotype.— Cat. No. 41951, U.S.N.M. 



GiLBERTSocRiNiTES AMERicANUS Troost. See Diabolocrinus vesperalia. 



GiLBERTSocRiNiTEs(?) DUBius Troost. See Periechocrinus dubius. 



Gilbi:rtsocrinites roemeri Troost. Sec Dimerocrinus roemeri. 



GIRVANELLA Nicholson and Etheridge. 



Genotype: G. problcmatica Nicholson and Etheridge. 



Girvanella Nicholson and Etheridge, Mon. Sil. Foss. Girvan Dist., 1878, p. 23, 

 pi. 9, fig. 24.— Nicholson, Geol. Mag., dec. 3, 4, 1888, p. 22.-^ames, J. F., 

 Jour. Cincinnati Soc. Nat. Hist., 14, pt. 1, 1891, pp. 50, 51.— Dawson, Canadian 

 Rec. Sci., 7, 1896, p. 212. 



Strephochetus Seely, Amer. Jour. Sci. Arts, 3d ser., 30, 1885, p. 357; ibid., 32, 

 1886, p. 31.— Walcott, Bull. U. S. Geol. Surv., 30, 1886, p. 91.— Hinde, Geol. 

 Mag., dec. 3, 4. 1887, p. 227.— Miller, N. A. Geoi. Pal., 1889, p. 165.— Seely, 

 Rep. State Geol. Vermont, 3, 1902, p. 156. (Genotype: S. ocellatus Seely.) 



GIryanella antiqua Dawson. 



Girvanella antiqua Dawson, Canadian Rec. Sci., 7, 1896, p. 214. 

 Cambrian or I^ower Ordovician bowlder: Little Metis, Quebec. 



