438 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DIMEROCRINUS Phillips. Genotype: D. decadactylus Phillips. 



Dimerocrinites Phillips, in Murchison's Sil. Syst., 1839, p. 674. Muller, Monats- 

 ber. Berl. Akad., 1, 1841, p. 208. 



Dimerocrinus D 'Orbigny, Prodr. Pal., 1, 1850, p. 46; Cours elem. Pal., 2, p. 142. 

 Roemer, Leth. geog., 1855, p. 237. Salter, Cat, Camb. Sil. Fosa., 1873, p. 

 120. Zittel, Handb. Pal., 1, 1879, p. 368. Wachsmuth and Springer, Proc. 

 Acad. Nat. Sci. Philadelphia, 1881, pp. 358, 371, 405 (Rev. Pal. pt. 2, pp. 184, 

 197, 231); ibid., 1885, p. 323. Carpenter, Phil. Trans. Royal Soc. London, 

 174, 1884, p. 928. Bather, Treatise on'Zool., pt. 3, Echinoderma, London, 

 1900, p. 198. Zittel, Grundzuge Pal., 1, 1910, p. 161. Springer, Zittel- 

 Eastman Textb. Pal., 2d ed., 1913, p. 187. 



Thysanocrimis Hall, Pal. New York, 2, 1852, pp. 188, 355. Pictet, Traite" de Pal., 

 2d ed., 4, 1857, p. 317. Billings, Geol. Surv. Canada, Rep. Progr. for 1853-56, 

 1857, p. 262. Hall, 15th Rep. New York State Cab. Nat. Hist, for 1861, 1862, 

 p. 125. Dujardin and Hupe, Hist. Nat. des Zoophytes, 1862, pp. 128, 131. 

 Shumard, Trans. Acad. Sci. St. Louis, 2, 1866, p. 398. Zittel, Handb. Pal., 1, 

 1879, p. 377. Carpenter, Phil. Trans. Royal Soc. London, 174, p. 928. 

 Miller, N. A. Geol. Pal., 1889, p. 286. Wachsmuth and Springer, Mem. Mus. 

 Comp. Zool., Harvard, 20, 1897, p. 190. Wachsmuth, Zittel-Eastman Textb. 

 Pal. 1, 1900, p. 145. Weller, Bull. Chicago Acad. Sci., Nat. Hist. Surv., 4, 

 pt. 1, 1900, p. 70, fig. 36. Grabau, Bull. New York State Mus., 45, 1901, p. 

 155; Bull. Buffalo Soc. Nat. Sci., 7, 1901, p. 155. Slocom, Field Columbia 

 Mus., 2, No. 10, Geol. Ser., 1908, p. 299. Grabau and Shimer, N. A. Index 

 Fossils, 2, 1910, p. 547. (Genotype: T. liliiformis Hall.) 



Eucrinus Angelin, Icon. Grin., 1878, p. 24, pi. 6, figs. 8, 8a. Zittel, Handb. Pal., 

 1, 1879, p. 375. Wachsmuth and Springer, Proc. Acad. Nat. Sci. Philadelphia, 

 1881, pp. 358, 370 (Rev. Pal., pt. 2, pp. 184, 196); ibid., 1885, p. 323. Ringue- 

 berg, Ann. New York Acad. Sci., 5, 1890, p. 305 Bather, Treatise on Zool. 

 (Lankester), pt. 3, 1900, p. 199. Zittel, Grundzuge Pal., 1, 1910, p. 161. 

 (Genotype: E. laevis Angelin.) 



Glyptaster Hall, Pal. New York, 2, 1852, p. 187; Trans. Albany Inst., 4, 1863, 

 p. 202. Shumard, Trans. Acad. Sci. St. Louis, 2, 1866, p. 373. Hall, 28th 

 Rep. New York State Mus. Nat. Hist., Mus. ed., 1879, p. 131. Zittel, 

 Handb. Pal., 1, 1879, p. 375. Wachsmuth and Springer, Proc. Acad. Nat. 

 Sci. Philadelphia, 1881, pp. 358, 367 (Rev. Pal., pt. 3, pp. 184, 193). Hall, 

 llth Ann. Rep. Indiana Dep. Geol. Nat. Hist., 1882, p. 259. Miller, N. A. 

 Geol. Pal., 1889, p. 247. Bather, Treatise on Zool. (Lankester), pt. 3, 1900, 

 p. 198. Zittel, Grundzuge Pal., 1910, p. 161. (Genotype: G. brachiatus 

 Hall.) 



Dimerocrinus aculeatus (Hall). 



Thysanocrinus aculeatus Hall, Pal. New York, 2, 1852, p. 190, pi. 42, figs. 3a-d. 



Pictet, Traite de Pal., 2d ed., 4, 1857, p. 317, pi. 100, fig. 13. 

 Rhodocrinus (Thysanocrinus) aculeatus Shumard, Trans. Acad. Sci. St. Louis, 



2, 1866, p. 398. 

 Clinton (Rochester): Lockport, New York. 



Dimerocrinus arborescens (Talbot). 



Thysanocrinus arborescens Talbot, Amer. Jour. Sci., 20, 1905, p. 23, pi. 1, fig. 2; 



text fig. 1. 

 Helderbergian (Manlius transition beds, or Coeymans): North Litchfield, New 



York. 



