BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 433 



Didymograptus Indentus Continued. 



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

 p. 647, pi. 33, figs. 7a-7c. Barrels, 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 gem inns 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, Mon. 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 pi anus Elles and Wood. 



Didymograptus nicholsoni var. planus Elles and W T ood, 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, Rensselaer 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. Ether idge, 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 Nicholson, 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, Tetragraptgs zone); Arkansas; England (Skiddaw); France; 

 Australia; Norway; Argentina. 



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