416 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DICRANOGRAPTUS Continued. 



Textb. Pal., 1, 1900, p. 119. Ruedemann, Mem. New York State Mus., 11, 

 pt. 2, 1908, pp. 315-317; Zittel-Eastman Pal., 2d ed., 1913, p. 130. Grabau 

 and Shimer, N. A. Index Fossils, 1, 1906, p. 32. 



Dicranograpsus Nicholson, Ann. Mag. Nat. Hist., 4th ser., 6, 1870, p. 371; Mon. 

 British Grapt., 1872, p. 118. 



DICRANOGRAPTUS ARKANSASENSIS Gurley. See Dicranograptus ramosus arkan- 

 sasensis. 



DICRANOGRAPTUS ARUNDINACEUS Hall. See Mastigograptus arundinaceus. 



Dicranograptus contortus Ruedemann. 



Dicranograptus contortus Ruedemann, Mem. New York State Mus., 11, pt. 2, 



1908, pp. 337-338, pi. 23, fig. 9; figs. 275-278. 

 Chazyan (Normanskill) : Kenwood and Troy, New York. 



DICRANOGRAPTUS DISSIMILARIS Emmons. See Diplograptus foliaceus. 

 DICRANOGRAPTUS DIVARICATUS Walcott. See Dicellograptus divaricatus. 

 DICRANOGRAPTUS FORMOSUS Hopkinson. See Dicellograptus sextans. 



Dicranograptus furcatus (Hall). 



Graptolithus furcatus Hall, Pal. New York, 1, 1847, p. 237, pi. 74, figs. 4a-h. 



Chapman, Can. Jour., 1, 1856, p. 390, fig. 10. 

 Dicranograptus furcatus Hall, Geol. Surv. Canada Can. Org. Rem., dec. 2, 1865, 



p. 15. Lapworth, Ann. Mag. Nat. Hist., 5, 1880, p. 283. Walcott, Alb. 



Inst. Trans., 10, 1883 (Adv. sheet, 1879), p 34. Whitfield, Am. Jour. Sci., 



3d ser., 26, 1883, p. 380. Walcott, Geol. Soc. Bull., 1, 1890, p. 339. Gurley, 



Jour. Geol., 4, 1896, p. 297. Ruedemann, Mem. New York State Mus., 11, 



pt. 2, 1908, pp. 334-336, pi. 23, fig. 7; text fig. 272. 

 Dicranograptus nicholsoni Freeh, Leth. Pal., 1, 1897, p. 617, fig. 181. 

 Chazyan (Normanskill): Glenmont, etc., New York; Silver Peak Quadrangle, 



Nevada. 

 Plesiotypes.M. No. 54251, U.S.N.M. 



Dicranograptus furcatus exills Ruedemann. 



Dicranograptus furcatus var. exilis Ruedemann, Mem. New York State Mus., 11, 



pt. 2, 1908, p. 337, pi. 23, fig. 8; figs. 273-274. 

 Chazyan (Normanskill): Kenwood, New York. 



DICRANOGRAPTUS IN^EQUALIS (Emmons). See Cladograptus inaequalis. 



Dicranograptus nicholsoni Hopkinson. 



Dicranograptus nicholsoni Hopkinson, Geol. Mag., 7, 1870, p. 357, pi. 16, fig. 3. 

 Lapworth, Cat. West. Scott. Foss., 1876, p. 6, pi. 3, fig. 79; Belfast Nat. Field 

 Club, Rep. and Proc., App., 1, pt. 4, 1877, p. 141, pi. 7, fig. 2. Tullberg, 

 Sver. Geol. Unders., ser. C, No. 50, 1882, p. 20. Gurley, Jour. Geol., 4, 1896, 

 p.297. EllesandWood, Mon. British Grapt., pt. 4, 1904, p. 171, pi. 25, figs, 

 la-h. T. S. Hall, Proc. Roy. Soc. Victoria, 18, 1905, p. 24, pi. 6, fig. 7; 

 Rec. Geol. Surv. Victoria, 1, pt. 4, 1906, p. 274. Ruedemann, Mem. New 

 York State Mus., 11, pt. 2, 1908, pp. 317-320, pi. 20, figs. 3, 5; pi. 21, fig. 1; figs. 

 241,242. 



Middle Ordovician: Great Britain (Glenkiln and Hartfell); Scania; Victoria; 

 Saratoga County, etc., New York (Trenton-Utica) ; Ohio (Fulton). 



Plesiotypes.C&t. Nos. 54247, 54269, U.S.N.M. 



