BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 441 



DIMORPHOGRAPTUS Lapworth. Genotype: D. elongatus Lapworth. 



Dimorphograptus Lapworth, Geol. Mag., dec. 2, 3, 1876, p. 545. — Elles and Wood, 

 Mon. British Grapt., 8, 1911, p. 348. 



Dimorphograptus decussatus Elles and Wood. 



Dimorphograptus decussatus Elles and Wood, Mon. British Grapt., 8, 1911, p. 



352, pi. 35, figs. 5a-e. 

 Silurian: Scotland (Llandovery -Birkhill); Blaylock Mountain, Montgomery' 



County, Arkansas (Blaylock) fUlrich]. 



DINOBOLUS Hall. Genotype: Obolus conradi Hall. 



Dinobolus Hall, Notes on Some New or Imperfectly Known Forms among the 

 Brach., (March) 1871, p. 4; ibid., 1872, p. 4.— Davidson and King, Geol. 

 Mag., 9, p. 442; Ann. Mag. Nat. Hist., 4th ser., 10, p. 248.— Hall, 23d Rep. 

 New York State Cab. Nat. Hist., 1873, p. 247.— Hall and Whitfield, Pal. 

 Ohio, 2, 1873, p. 130. — Davidson and King, Quart. Jour. Geol. Soc. London, 

 30, 1874, p. 159.— Zittel, Handb. Pal., 1, 1880, p. 668.— Miller. N. A. Geol. 

 Pal., 1889, p. 343.— Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 36, 

 46, 164; 11th Ann. Rep. New York State Geol., 1894, p. 237.— Koken, Die 

 Leitfossilien, Leipzig, 1896, p. 231, fig. 190, 2.— Schuchert, Zittel-Eastman 

 Pal., 1, 1900, p. 306, 2d ed., 1913, p. 373.— Grabau and Shimer, North Amer. 

 Index Fossils, 1, 1907, p. 190. 



Obolellina Billings, Canadian Nat. Geol., 6, 1871, p. 222; ibid., 6, 1872, p. 326, 

 figs. 1, 2; Amer. Jour. Sci., 3d ser., 3, 1872, p. 270. 



Conradia Hall (not Adams), 23d Rep. New York State Cab. Nat. Hist., 1873, p. 

 250. — Davidson and King, Quart. Jour. Geol. Soc. London, 30, 1874, p. 159. 



Dinobolus canadensis (Billings). 



Obolus canadensis Billings, Canadian Nat. Geol., 3, 1858, p. 441, fig. 20-23 (not 



fig. 19=D. magnificus); Geol. Surv. Canada; Rep. Prog, for 1857, 1858, p. 



189, figs. 20-23 (not fig. 19); Geol. Canada, 1863, p. 142, figs. 75. 

 Obolellina canadensis Billings, Canadian Nat. Geol., 6, 1871, p. 222; ibid., 



1872, p. 326, fig. 15; fig. 6, p. 329. 

 Dinobolus canadensis Davidson and King, Quart. Jour. Geol. Soc. London, 30, 



1874, p. 162, pi. 19, fig. 7. 



Black River (Leray): Banquette's Rapids, etc., Canada. 



Dinobolus conradi (Hall). 



Obolus conradi Hall, 20th Rep. New York State Cab. Nat. Hist., 1868, p. 368, 



pi. 13, figs. 1, 2.— Chamberlin, Geol. Wisconsin, 1, 1883, p. 192, fig. 

 Obolua (Trimerella?) com-adi Meek and Woi-then, Geol. Surv. Illinois, 3, 1868, 



p. 351, pi. 5, fig. 7. 

 Trimerella conradi Dall, American Jour. Conch., 7, 1871, p. 83. 

 Dinobolus conradi Hall, 23d Rep. New York State Cab. Nat. Hist., 1873, p. 247 



(also extracts 1871, 1872). — Davidson and King, Quart. Jour. Geol. Soc. 



London, 30, 1874, p. 160, pi. 18, figs. 1-5.— Hall and \MiitfieId, Pal. Ohio, 2, 



1875, p. 130, pi. 7, figs. 3, 4.— Hall and Clarke, Pal. New York, 8, pt. 1, 1892, 

 p. 38, pi. 4B, figs. 13-24.— Kindle and Breger, 28th Ann. Rep. Dep. Geol. 

 Nat. Res. Indiana, 1904, p. 428, pi. 1, fig. 8.— Grabau and Shimer, N. A. 

 Index Fossils, 1, 1907, p. 190, fig. 255a. 



Niagaran: Port Byron, Illinois; Leclaire, Iowa; Racine and Grafton, Wisconsin 



(Racine); Crawford, Ohio; England; Gotland. 

 Plesiotype.—Cat. No. 52938, U.S.N.M. 



