414 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DICHOGRAPTUS ABNORMis Hall. See Clonograptus abnormis. 

 DICHOGRAPTUS DIVARICATES Whitfield. See Dicellograptus divaricatus. 

 DICHOGRAPTUS FLABELLIFORMIS Brogger. See Dictyonema flabelliforme. 

 DICHOGRAPTUS FURCATUS Whitfield. See Dicranograptus furcatus. 

 DICHOGRAPTUS LOGANI Nicholson. See Loganograptus logani. 



Dichograptus octobrachiatus (Hall). 



Graptolithus octobrachiatus Hall, Geol. Surv. Canada, Rep. for 1857, 1858, p. 122; 

 Geol. Surv. Canada, Can. Org. Hem., dec. 2, 1865, p. 96, pi. 7, figs. 1-7; 

 pi. 8, figs. 1-4. Billings, Geol. Canada, Geol. Surv. Canada, 1863, p. 226, 

 fig. 232. 



Dichograpsus aranea Salter, Quart. Jour. Geol. Soc., 19, 1863, p. 137, figs. 9, 10. 



Graptolithus (Loganograptus) octobrachiatus Hall, 20th Rep. New York State 

 Cab. Nat. Hist., 1868, p. 174, fig. 5; pi. 3, figs. 23-27; rev. ed., 1870, p. 207, 

 fig. 5, pi. 3, fig. 23-27. 



Graptolithes (Didymograptus) octobrachiatus McCoy, Geol. Surv. Victoria, 

 Prod. Pal. Victoria, dec. 1, 1874, p. 17, pi. 2, fig. 4. 



Dichograpsus octobrachiatus Nicholson, Quart. Jour. Geol. Soc., 24, 1868, p. 129, 

 pi. 5, figs. 1, 2; Ann. Mag. Nat. Hist., 4th ser., 1, 1868, p. 56, pi. 3, fig. 6. 



Dichograp tus octobrachiatus Nicholson, Mon. British Grapt., 1872, p. 107, fig. 50. 

 Brogger, Die silurischen Etagen, 2, 3, 1882, p. 38. Herrmann, Nyt. Mag. 

 Naturv., 29, 1885, p. 124; Geol. Mag., dec. 3, 3, 1886, p. 22, fig. 7. Le- 

 crenier, Ann. Soc. Geol. Belg., 14, 1887, p. 182. Ami, Geol. Surv. Canada 

 Rep., 2d ser., 3, pt. 2, 1889, p. 117k. Tornquist, Lunds Univ. Arsskrift., 26, 

 1891, p. 12, pi. 1, fig. 1. Nicholson and Marr, Geol. Mag., dec. 4, 2, 1895, 

 p. 534, fig. Gurley, Jour. Geol., 4, 1896, p. 294. Roemer and Freeh, Leth. 

 geog., Leth. Pal., 1, 1897, p. 595. Elles, Quart. Jour. Geol. Soc., 54, 1898, 

 p. 483. Ruedemann, New York State Pal., Ann. Rep. 1902, pp. 554, 556. 

 Elles and Wood, Mon. British Grapt., pt. 1, 1902, p. 77, pi. 9; pi. 10, figs, 

 la-e. Ruedemann, Mem. New York State Mus., 7, pt. 1, 1904, pp. 634-637, 

 pi. 8, figs. 1-7; pi. 9, figs. 1-2. Grabau and Shimer, N. A. Index Fossils, 

 1, 1906, p. 28, fig. 41. 



Canadian: Point Levis, Quebec (Levis, Didymograptus zone); Deepkill, Rens- 

 eelaer County, New York (Deepkill, Tetragraptus, Didymograptus, and 

 Diplograptus zones); England (Skiddaw); Wales (Arenig); Scandinavia; 

 Belgium; Australia. 



Dichograptus octonarius (Hall). 



Graptolithus octonarius Hall, Canadian Nat. Geol., 3, 1858, p. 148; Geol. Surv. 



Canada, Rep. Progr. for 1857, 1858, p. 124; Geol. Surv. Canada, dec. 2, 



1865, p. 95, pi. 10, figs. 1, 2. 

 Graptolithus (Monoprion) octonarius Hall, 20th Rep. New York State Cab. Hist., 



1868, p. 226, pi. 3, fig. 22; rev. ed., 1870, p. 260, pi. 3, fig. 22; p. 223. 

 Dichograpsus octonarius Gurley, Jour. Geol., 4, 1896, p. 95 (gen. ref.) 

 Dichograptus octonarius Hall (T. S.), Geol. Mag., dec. 4, 6, 1899, p. 449, pi. 22, 



fig. 7. 

 Canadian: Point Levis, Quebec (Levis); Australia. 



DICHOGRAPTUS THUREAUI Freeh. See Goniograptus thureaui. 



Dichotrypa grandis Ulrich. ^ 



Dichotrypa grandis Ulrich, Geol. Surv. Illinois, 8, 1890, p. 498, pi. 43, figs. 1-1< 

 Niagara (?): Will County, near Wilmington, Illinois (?). 



Observation. This form is probably from the St. Louis group of Illinois ai 

 may be the same as Dichotrypa elegans Ulrich. 



