BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 433 



Didymograptus indentus— Continued. 



Didymograptus indentus Hopkinson, Quart. Jour. Geol. Soc. London, 31, 1875, 

 p. 647, pL 33, figs. 7a-7c.— Barrois, Ann. Soc. GeoL du Nord, 20, 1892, 

 p. 93.— Matthew, Trans. Royal Soc. Canada, 10, sec. 4, 1893, p. 99.— Elles, 

 Quart. Jour. GeoL Soc! London, 54, 1898, p. 510. 

 Canadian: Point Levis, Quebec (Levis, Didymograptus zone); St. John, New 

 Brunswick (Bretonian-Div. C3d); Wales (Skiddaw). 



Didymograptus indentus var. nanus Lapworth. See Didymograptus nanus. 



Didymograptus nanus (Lapworth). 



Didymograpsus geminus Nicholson, Quar. Jour. Geol. Soc, 24, 1868, p. 134, pi. 5, 



figs. 8, 9; Ann. and Mag. Nat. Hist., ser. 4, 5, 1870, p. 346, fig. 6b. 

 Didymograptus indentus var. nanus Lapworth, Quar. Jour. Geol. Soc, 31, 1875, 



p. 647, pi. 33, fig. 7d; pi. 35, figs. 4a-c— Elles, Quar. Jour. Geol. Soc, 54, 



1898, p. 511. 

 Didymograptus nanus Elles and Wood, Men. British Grapt. pt. 1, Pal. Soc, 1901, 



p. 47, pi. 4, figs. 5a-h. — Ruedemann, Mem. New York State Mus., 7, pt. 1, 



1904, pp. 692, 693, pi. 15, figs. 4, 5; text fig. 88. 

 Lower Ordovician: Wales (Arenig); England (Skiddaw); Deepkill, Rensselaer 



County, New York (Deepkill, Didymograptus bifidus zone). 



Didymograptus nicholsoni planus Elles and Wood. 



Didymograptus nicholsoni var. planus Elles and Wood, Mon. British Grapt., pt. 

 1, Pal. Soc, 1901, p. 29, pi. 2, figs. 5a, b.— Ruedemann, Mem. New York State 

 Mus., 7, pt. 1, 1904, pp. 685, 686, pi. 13, figs. 10-14, text figs. 82, 83. 



Lower Ordovician: England (Skiddaw); Deepkill, Renp^elaer County, New York 

 (Deepkill, Tetragraptus zone). 



Didymograptus nitidus (Hall). 



Graptolithus nitidus Hall, Geol. Surv. Canada Rep., 1857, 1858, p. 129; Can. 

 Nat. and Geol., 3, 1858, p. 163; Canadian Org. Rem., dec. 2, 1865, p. 69, pi. 1, 

 figs. 1-9. 



Graptolithus (Monoprion) nitidus Hall, 20th Rep. New York State Cab. Nat. 

 Hist., 1868, p. 226, pi. 3, figs. 8, 9; rev. ed., 1870, p. 234, pi. 3, figs. 8, 9, p. 

 223. 



Didymograptus nitidus Nicholson (part.), Quar. Jour. Geol. Soc. London, 24, 1868, 

 p. 135.— Etheridge, jr. , Ann. Mag. Nat. Hist. , 4th ser. , 14 , 1874, 6, pi. 3 , fig. 20.— 

 Herrmann, Geol. Mag., dec. 3, 3, 1886, p. 15. — Barrois, Ann. de la Soc. Geol. 

 du Nord, 1892, 20, p. 91.— Matthew, Trans. Roy. Soc. Can., 10, sec. 4, 1893, 

 p. 98.— Elles (part.), Quar. Jour. Geol. Soc, 54, 1896, 499-502; p. 500, fig. 19; 

 p. 501, fig. 20.— Roemer and Freeh, Leth Geog., 1, Theil, LethPal., 1, Lief., 3, 

 1897, p. 591, fig. 160.— Elles, Quart. Jour. Geol. Soc. London, 34, 1898, p. 499, 

 figs. 19, 20, p. 500.— Elles and Wood, Mon. British Grapt., pt. 1, Pal. Soc, 

 1901, p. 10, pi. 1, figs. 2a-c, figs. 5a-d.— Ruedemann, New York State Pal. 

 Ann. Rep., 1902, p. 554, 556; Mem. New York State Mus., 7, pt. 1, 1904, pp. 

 671-674, pi. 13, figs. 1-4; pi. 14, figs. 5, 6, text figs. 66-70.— Grabau and Shi- 

 mer, N. A. Index Fossils, 1, 1906, p. 31, fig. 47a, 49a.— Hoek, Neues Jahrb. 

 Min. Geol. Pal, 34, 1912, p. 220, pi. 13, figs. 8, 9. 



Didymograpsus (Graptolithus) nitidus Nicholsou, Mon. British Grapt., 1872, p. 80, 

 fig. 45. 



Canadian: Point Levis, Quebec (Levis, Didymograptus zone); St. John, New 

 Brunswick (Bretonian — Div. C3d); Deepkill, Rensselaer County, New York 

 (Deepkill, Tetragraptus zone); Arkansas; England (Skiddaw); France; 

 Australia; Norway; Argentina. 



84243°— Kull. 92—15 28 



