438 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DIMEROCRINUS PhillipH. Genotype: D. decadactyliis Phillips. 



Dimerocrinites Phillips, in Mui-chison's Sil. Syst., 1839, p. 674. — MuUer, Monats- 

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



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

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

 120.— Zittel, Handl). Pal., 1, 1879, p. 3G8.— 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, Grundzugo Pal., 1, 1910, p. 161.— Springer, Zittel- 

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



Thysanocrinns Hall, Pal. New York, 2, 1852, pp. 188, 355.— Pictet, Trait6 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 Ilupe, 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 Textl). 

 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. liUiformis Hall.) 



Eucrinus Angelin, Icon. Crin., 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., 18S5, 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. Isevis 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, 

 11th Ann. Rep. Indiana Dep. Geol. Nat. Hist., 1882, p. 259.— Mller, 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.) 



Dlmorocrinus 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): Lockiwrt, New York. 



DImerocrinus arborescens (Talbot). 



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



text fig. 1. 

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



York. 



