668 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



locrlnus subcrassus Continued. 



locrinus Bubcrassus 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, Echinodenna, London, p. 120, fig. 

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

 pi. 4, figs. 7, 7a. 



Heterocrinus? (locrinus) 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. 



locrinus trentonensis Walcott. 



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



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

 Trenton: Trenton Falls, New York. 



ISCHADITES Murchison. Genotype: Tetragonis murchisom Eichwald. 



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

 Soc. Nat. Hist., 1, 1865, p. 86. Gumbel, Abh. d. Math.-Ph.ys. Classe 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., Erste Lief, 1880, p. 291. 

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

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

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

 p. 606. Hinde, Mon. British Foss. Sponges, Palaeontographical Soc., 1888, 

 p. 119. Rauff, Abh. d. math.-phys. Classe d. k. bayer. Akad. Wiss., 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. 



Pakeospongia 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. 

 Deutschen 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, cyathiformis Hall.) 



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

 Jour., n. s., 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. 



Receptaculites (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. 

 Receptaculites 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. London, 40, 1884, p. 844. 

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



Ischadites circularis (Emmons). 



Receptaculites circularis 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. 



