668 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



locrluus subcrassus — Continued. 



locrinuB subcrassus Wachsmuth and Springer, Proc. Acad. Nat. Sci. Philadelphia, 

 1879, p. 295 (Rev. Pal., pt. 1, p. 72); ibid., 1890, p. 381, pi. 10, fig. 5.— Bather, 

 Geol. Mag., dec. 4, 6, 1899, p. 35, fig. 11.— Miller, N. A. Geol. Pal., 1889, 

 p. 257, fig. 346; Treatise on Zool., pt. 3, Ecliinoderma, London, p. 120, fig. 

 26, 1.— Cumings, 32d Ann. Ilep. Dep. Geol. Nat. Res. Indiana, 1908, p. 726, 

 pi. 4, figs. 7, 7a. 



Heterocrinus? (locrinue) Polyxo Hall, 24th Rep. New York State Cab. Nat. Hist., 

 1872, p. 212, pi. 5, figs. 1-4 (extract, 1871). 



Trenton-Richmond: Cincinnati, Ohio, and vicinity; Indiana; Kentucky. 



locrlnus trentononsis Walcott. 



locrinus trentonensis Walcott, 35th Rep. New York State Mub. Nat. Hist., 1884, 



p. 210, pi. 17, figs. 7, 8. 

 Trenton: Trenton Falls, New York. 



ISCHADITES ^Imx'hison. Genotype: Tetragonis murchisoni Eichwald. 



Ischadites Murchison, Siluria, 1837, p. 697. — Winchell and Marcy, Mem. Boston 

 Soc. Nat. Hist., 1, 1865, p. 86.— Gumbel, Abh. d. Math.-Phys. Clasee d. k. 

 Bay. Akad. d. Wise., 12, 1 Abth., 1875, p. 172.— Nicholson and Etheridge, 

 Mon. Sil. Foss. Girvan Dist., 1878, p. 19.— Zittel., Handb. Pal., 1, 1880, p. 

 728.— Roemer, Leth. Geog., 1, Theil, Leth. Pal., Erete Lief, 1880, p. 291.— 

 Hinde, Qtiart. Jour. Geol. Soc. London, 11, 1884, p. 810. — James, J. F., Jour. 

 Cincinnati Soc. Nat. Hist., 9, 1886, pp. 246, 249.— SclJuter, Zeits. d. d. geol. 

 Geeell., 39, 1887, p. 7.— Geinitz, ibid., 40, 1888, p. 19.— Rauff, ibid., 40, 1888, 

 p. 606. — Hinde, Mon. British Foes. Sponges, Palaeontographical Soc., 1888, 

 p. 119. — Rauff, Abh. d. math.-phys. Classe d. k. bayer. Akad. Wisa., 18, 3, 

 Abth., 1892, p. 692.— Winchell and Schuchert, Geol. Minnesota, 3, pt. 1, 1895, 

 p. 61, pi. F, figs. 5-10; Zittel-Eastman Textb. Pal., 2d ed., 1913, p. 72. 



Palseospongia D'Orbigny, Prodr. de Pal., 1, 1849, p. 26.— Pictet, Traite de Pal., 

 2d ed., 4, 1857, p. 540. — Bornemann, Nova Acta der Ksl. Leop. -Carol. 

 Deutechen Akad. der Natur., 51, 1886, p. 21.— Hinde, Geol. Mag., dec. 3, 4, 

 1887, p. 228.— Miller, N. A. Geol. Pal., 1889, p. 162.— Rauff, Neues Jahrb. f. 

 Min., Geol. Pal., 2, 1891, p. 92. (Genotype, cyatluformis Hall.) 



Tetragonis Eichwald, Unvelt. Russlands, heft 2, 1842, p. 81. — Chapman, Canadian 

 Jour., n. B., 2, 1857, p. 304. — Billings, Pal. Foss., 1, Geol. Surv. Canada, 

 1865, p. 386.— Roemer, Leth. Geog., 1 Theil, Leth. Pal., Erste Lief, 1880, p. 

 303.— Zittel, Handb. Pal., 1, 1880, p. 728.— Roemer, Zeits. d. d. Gesell., 35, 

 1883, pp. 705, 707. 



Selenoides Owen, Geol. Surv. Wisconsin, Iowa, and Minnesota, 1852, p. 586. 



Dictyocrinus Hall, Pal. New York, 3, 1859, p. 135. 



Receptaculitea (part) Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 378. 



Ischadites canadensis Billings. 



Ischadites canadensis Billings, Geol. Canada, 1863, p. 309, fig. 313; p. 327. — 



Winchell and Schuchert, Geol. Minnesota, 3, pt. 1, Pal., 1895 (ext., 1893), 



p. 66. 

 ReceptacuUtes canadensis Billings, Pal. Foss., 1, 1865, p. 384, fig. 363; Canadian 



Nat. Geol., 2d ser., 2, 1865, p. 191, fig. 10.— Roemer, Leth. Pal., 1880, p. 289.— 



Hinde, Quart. Jour. Geol. Soc. Londou, 40, 1884, p. 844. 

 Niagaran (Lockport?): Township of Esquesing, Ontario. 



Ischadites clrcularls (Emmons). 



ReceptacuUtes circularia Emmons, Amer. Geology, 1, pt. 2, 1855, p. 230, fig. 82; 

 Man. Geol., 1860, p. 103, fig. 93.— Lesley, Geol. Surv. Pennsylvania, Rep. P4, 

 1889, p. 852, fig.— James, Jour. Cincinnati Soc. Nat. Hist., 14, p. 63, pt. 1. 



