460 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Disco trypa elegans (Ulrich). 



Chaetetes elegans Ulrich, Jour. Cincinnati Soc. Nat. Hist., 2, 1879, p. 130, pi. 



12, figs. 12, 12a. 



Discotrypa elegans Ulrich, ibid., 6, p. 163, pi. 7, fig. 1-lb. 

 Monticulipora elegans James and James, ibid., 10, 1888, p. 165. J. F. James, ibid., 



16, 1894, p. 180. 



Maysville (Fairmount): Cincinnati, Ohio, and vicinity. 

 HolotypeC&t. No. 43653, U.S.N.M. 



DISTACODUS Hinde. Genotype: Machairodus incurvus Pander. 



Machairodus Pander, Mon. Foss. Fische Sil. Syst., 1856, p. 23. 

 Distacodus Hinde, Quart. Jour. Geol. Soc. London, 35, 1879, p. 357. (Proposed 

 for Machairodus Pander, preoccupied by Kaup.) Miller, N. A. Geol. Pal., 

 1889, p. 518. 



Distacodus Incurvus (Pander). 



Machairodus incurvus Pander, Mon. Foss. Fische Sil. Syst., 1856, p. 23, tab. 1, 



fig. 22. 

 Distacodus incurvus Hinde, Quart, Jour. Geol. Soc. London, 35, 1879, p. 357, pi. 



15, fig. 9. 



Middle Ordovician: Esthonia, Russia. 

 Maysville (Pulaski): Garrison Common, near Toronto, Ontario. 



DIT<ECHOLASMA Simpson. Genotype: Petraia fanningana Safford. 



Ditcecholasma Simpson, Bull. New York State Mus., 39, 1900, p. 200. 



Ditcecholasma fanninganum (Safford). 



Petraia Fanningana Safford, Geol. Tennessee, 1869, p. 320, pi. 5, (H), figs. 3a-g. 



Lesley, Geol. Surv. Pennsylvania, Hep. P 4, 1889, p. 627, figs. 

 Duncan ella fanningana Girty, 19th Ann. Rep. U. S. Geol. Surv., 1899, p. 552. 

 Ditoecholasma fanninganum Simpson, Bull. New York State Mus., 39, 1900, p. 



201, figs. 5, 6. 



Ditcecholasma (Petraia) fanningana Foerste, Jour. Geol., 11, 1903, p. 713 (loc. occ.). 

 Niagaran (Brownsport): Decatur, Perry, and Wayne Counties, Tennessee. 



DOLABRA CARINATA Meek. See Whitella carinata. 



DOLABRA STERLINQENSIS Meek and Worthen. See Whitella sterlingensis. 



DOLICHOMETOPUS Angelin. Genotype: D. suecicus Angelin. 



Dolichometopus Angelin, Pal. Scandinavica, 3d ed., Holmice, 1878, p. 72. 

 Woodward, Geol. Mag., dec. 3, 1, 1884, p. 343. Zittel, Handb. Pal., 2, 1885, 

 p. 599. Miller, N. A. Geol. Pal., 1889, p. 545. Koken, Die Leitfossilien, 

 Leipzig, 1896, p. 15. Matthew, Trans. Royal Soc. Canada, 2d ser., 3, sec. 

 4, 1897, pp. 184, 195. Walcott, Cam. Faunas China, Yearb.. Carnegie Inst., 3, 

 1913, p. 215. Clarke, Zittel-Eastman Textb. Pal., 2d ed., 1913, p. 783. 



Amphoton Lorenz, Zeit. deutsch. geol. Gesell., 58, 1906, p. 75. (Genotype: A. 

 eteinmanni Lorenz.) 



Dollchometopus(?) conyexus Billings. 



Dolichometopus? convexus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 



269, fig. 253. 

 Canadian (Quebec-G): Port aux Choix, Newfoundland. 



Dollchometopus(?) gibberulus Billings. 



Dolichometopus? gibberulus Billings, Pal. Foss., 1, 1865, Geol. Surv. Canada, p. 



269, fig. 254. 

 Canadian (Quebec-G): Port aux Choix, Newfoundland. 



