844 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



MYELODACTYLUS Hall. Genotype: M. con volutus Hall. 



MyelodactylusHall, Pal. New York, 2, 1852, p. 191. Angelin, Icon. Crinoid. Suec., 

 1878, p. 11. Zittel, Handb. Pal., 1, 1879, p. 354. Wachsmuth and Springer, 

 Proc. Acad. Nat. Sci. Philadelphia, 1879, p. 369 (Rev. Pal., pt. 1, p. 146). 

 Miller, Jour. Cincinnati Soc. Nat. Hist., 3, 1880, p. 142. Nicholson and 

 Etheridge, Mon. Sil. Foss. Girvan Diet., 1880, p. 330. Miller, N. A. Geol. 

 Pal., 1889, p. 262; 2d App., 1897, p. 749. Weller, Bull. Chicago Acad. Sci., 

 Nat. Hist. Surv., 4, pt. 1, 1900, p. 45, 68. Wachsmuth, Zittel-Eastman 

 Textb. Pal., 1, 1900, p. 153. 



Herpetocrinus Salter, Cat. Camb. and Sil. Foss., 1873, p. 118. Nicholson and 

 Etheridge, Mon. Sil. Foss. Girvan Dist., 1880, p. 331. Bather, Kongl. fSv. 

 Vet. Akad. Handl., 25, No. 2, 1893, pp. 21, 36, pis. 1, 2, figs. 24-78; fig. 12; 

 Amer. Geol., 16, 1895, p. 214; Nat. Sci., 12, 1898, p. 339; Treatise on Zool., pt. 

 3, Echinoderma, London, 1900, p. 146, fig. 49. Zittel, Grundzuge Pal., 1, 

 1910, p. 151. Springer, Zittel-Eastman Textb. Pal., 1, 1913, p. 212. (Geno- 

 type: H. fletcheri Salter). 



Myelodactylus brachiatus Hall. 



MyelodactylusbrachiatusHall, Pal. New York, 2, 1852, p. 232, pi. 45, figa. 7a-e. 

 Clinton (Rochester): Lockport, New York. 



Myelodactylus bridgeportensis Miller. 



Myelodactylus bridgeportensis Miller, Jour. Cincinnati Soc. Nat. Hist., 3, 1880, 

 p. 141, pi. 4, figs. 2, 2a-c; N. A. Geol. Pal., 1889, p. 262, fig. 368 Weller, 

 Bull. Chicago Acad. Sci., Nat. Hist. Surv., 4, pt. 1, 1900, p. 69, pi. 15, figs. 1-2. 

 Niagaran (Racine): Bridgeport, Illinois. 



Myelodactylus conyolutus Hall. 



Myelodactylus convolutus Hall, Pal. New York, 2, 1852, p. 193; pi. 42, figs. 5a, b; 

 6a-h. Nicholson and Etheridge, Mon. Sil. Foss. Girvan Dist., 1880, p. 331. 

 Clinton (Rochester) : Lockport, New York. 



Myelodactylus gorbyi Miller. 



Myelodactylus gorbyi Miller, 17th Ann. Rep. Indiana Dep. Geol. Nat. Res., 1892, 



p. 682, pi. 11, figs. 6, 7 (adv. sheets, 1891, p. 72); N. A. Geol. Pal., 2d. App., 



1897, p. 749, fig. 1365. 

 Niagaran (Waldron): Near Nashville (Newsom), Tennessee. 



MYBIANITES MacLeay. Genotype: M. macleaii Murchisun. 



Myrianites MacLeay, Murchison's Sil. Syst., p. 700; Ann. Nat. Hist., 4 1840, 

 p. 387. Richter, Zeits. d. d. geol. Gesell., 1, 1849, p. 457; ibid., 5, 1853, 

 450. McCoy, British Pal. Bocks and Foss., 1854, p. 129. Nicholson and 

 Etheridge, Mon. Sil. Foss. Girvan Dist., 1880, p. 305. Miller, N. A. Geol. 

 Pal., 1889, p. 519. 



Myrianites murchisoni Emmons. 



Myrianites murchisoni Emmons, Nat. Hist. New York 'Agric., 1, 1846, p. 69, pi. 



16, fig. 1. 

 Ordovician(?): Waterville, Maine. 



Myrianites sillimani Emmons. 



Myrianites sillimani Emmons, Nat. Hist. New York Agric., 1, 1846, p. 69, pi. 16, 



fig. 5. 

 Ordovician(?): Waterville, Maine. 



