414 BULLETIN 02, UNITED STATES NATIONAL MUSEUM. 



DiCHOGRAPTUs ABNORMis Hall. See Clonograptus abnormis. 

 DiCHOGRAPTus DivARicATus Whitfield. See Dicellograptus divaricatus. 

 DiCHOGRAPTUS FLABELLiFORMis Brogger. See Dictyonema flabelliforme. 

 DiCHOGRAPTUs FURCATus Whitfield. See Dicranograptus fiircatus. 

 DiCHOGRAPTUS LOGANi Nicholson. See Ldganograptus logani. 



Dichograptus octobrachiatus (Hall). 



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

 Geol. Surv. Canada, ('an. Org. Rem., 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. 



Dichograpsue 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 eer., 1, 1868, p. 56, pi. 3, fig. 6. 



DichograptusoctobrachiatusNicholson, 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 eer., 3, pt. 2, 1889, p. 117k.— Tornquist, Lunds Univ. Arsskrift., 26, 

 1891, p. 12, pi. 1, fig. 1.— Nicholson and Man', 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- 

 selaer 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 thureaid. 



Dichotrypa grandis Ulrich. 



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

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



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

 may be the same as Dichotrypa elegans Ulrich. 



