460 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Disco trypa elegans (Ulrich). 



Chsetetea 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. 

 Mouticulipora elegans James andJames, ibid., 10, 1888, p. 165. — J. F. James, ibid., 



16, 1894, p. ISO. 

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

 Bolotype— Cat. No. 43653, U.S.N.M. 



DISTACODUS Hinde. Genotype: Machairodus incurvois Pander. 



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

 Distacodus Hinde, Quart. Jour. Geol. Soc. London, 35, 1S79, p. 357. (Proposed 



for Machau'odus 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, Quai't, Jour. Geol. Soc. London, 35, 1879, p. 357, pi. 



15, fig. 9. 

 Middle Ordovician: Esthonia, Russia. 

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



DITCECHOLASMA Simpson. Genotype: Petraia fanningana Safford. 



Ditoecholasma 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, Rep. P4, 1889, p. 627, figs. 

 Duncanella fanningana Girty, 19th Ann. Rep. U. S. Geol. Siu-v., 1899, p. 552. 

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



201, figs. 5, 6. 

 Ditoecholasma (Petraia) fanningana Foerste, Joiu*. Geol., 11, 1903, p. 713 (loc. occ). 

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



DoLABRA CARiNATA Meek. See "Whitella carinata. 



DoLABRA STERLiNGENSis Meek and Worthen. See Whitella sterlingensis. 



DOLICHOMETOPUS Angelin, Genotype: D. euecicus Angelin. 



DoUchometopus Angelin, Pal. Scandinavica, 3d ed., Holmioe, 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 Tnst., 3, 

 1913, p. 215.— Clai-ke, Zittel-Eastman Textb. Pal., 2d ed., 1913, p. 783. 



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

 steinmanni Lorenz.) 



Dolichometopus(?) convexus Billings. 



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



269, fig. 253. 

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



Dolichometopus(?) gibberulus Billings. 



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



269, fig. 254. 

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



