1286 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Tretaspis diadem at a Ruedeinann. 



Tretaspis diademata Ruedemann, Bull. New York State Mus., 49, 1902, p. 49, 



pi. 3, figs. 13, 14. 

 Mohawkian (Rysedorph): Rysedorph Hill, Rensselaer County, New York. 



Tretaspis reticulata Ruedemann. 



Tretaspis reticulatus Ruedemann, Bull. New York State Mus., 49, 1902, p. 41 

 pi. 3, fig. 11, 15-20. Bassler, Bull. Virginia Geol. Surv., 2a, 1909, pi. 3, 

 figs. 20, 21. 



Mohawkian: Rysedorph Hill, Rensselaer County, New York (Rysedorph); Mary- 

 land and Virginia (Chambersburg). 



TRIACRINUS D'Orbigny. See Pisocrinus DeKoninck. 



Trianisites Rafinesque. Not recognized. 



Trianisites Rafinesque, Amer. Jour. Sci. Arts, 3, 1821, p. 286; Bull. Soc. Geol. 

 France, 10, 1839, p. 380. 



Trianisites cliffordi Rafinesque. Not recognized. 



Trianisites cliffordi Rafinesque, Amer. Jour. Sci. Arts, 3, 1821, p. 286, pi. 1, 



fig. A; Bull. Soc. Geol. France, 10, 1839, p. 379. 

 Trenton: Near Lexington, Kentucky. 

 Observation. Probably refers to some hemispheric bryozoan. 



Trianisites conradi Rafinesque. Not recognized. 



Trianisites Conradi Rafinesque, Bull. Soc. Geol. France, 10, 1839, p. 379. 

 Islands of St. Lawrence River. 



TRIARTHRUS Green. Genotype: Triarthrus beckii Green. 



Triarthrus Green, Mon. Tril. N. A., 1832, p. 86; Monthly Amer. Jour. Geol., 1, 

 1832, p. 560; Amer. Jour. Sci., 33, 1838, pp. 343, 344. Haldeman, ibid., 

 2d ser., 5, 1848, p. 107. Barrande, Neues Jahrb. Min. Geol. Pal., 1850, 

 p. 779. Pictet, Traite de Pal., 2d ed., 1854, p. 492. Emmons, Amer. Geol- 

 ogy, 1, pt. 2, 1855, p. 214. Hitchcock, Geol. Vermont, 1, 1862, p. 308. 

 Chapman, Canadian Jour., n. s., 8, 1863, p. 32; Expos. Min. Geol. Canada, 

 1864, p. 140. Miller, Cincinnati Quart. Jour. Sci., 1, 1874, p. 146. Zittel, 

 Handb. Pal., 2, 1885, p. 598. Miller, N. A. Geol. Pal., 1889, p. 568. Beecher, 

 Amer. Jour. Sci., 3d ser., 46, 1893, pp. 378, 467; ibid., 47, 1894, p. 298 

 Walcott, Geol. Mag., dec. 4, 1, 1894, p. 247. Bernard, Quart. Jour. Geol. 

 Soc. London, 51, 1895, p. 352. Koken, Die Leitfossilien, Leipzig, 1896, 

 p. 19, fig. 11, fig. 1. (Ehlert, Bull. Soc. Geol. France, 3d ser., 24, 1896, p. Ill, 

 figs. 25, 26. Beecher, Geol. Mag., dec. 4, 3, 1896, p. 193; Amer. Jour. Sci., 

 4th ser., 1, 1896, pp. 251-256; ibid., 3, 1897, p. 184; Zittel-Eastman Textb. 

 Pal., 1, 1900, p. 629. Jaekel, Zeits. d. d. geol. Gesell., 53, 1901, p. 136; ibid., 

 54, Brief Mitth., 1902, p. 55. Beecher, Amer. Jour. Sci., 4th ser., 13, 1902, 

 p. 165; Geol. Mag., dec. 4, 9, 1902, pp. 152-157. Grabau and Shimer, N. A. 

 Index Fossils, 2, 1910, p. 286. Raymond, Zittel-Eastman Textb. Pal., 1913, 

 p. 715. 



Triarthrus becki Green. 



Triarthrus beckii Green, Mon. Tril. N. A., 1832, p. 87, cast 34, pi. 1, fig. 6; Monthly 

 Amer. Jour. Geol., 1, 1832, p. 560, pi. 1, fig. 3. Harlan, Trans. Geol. Soc. 

 Pennsylvania, 1, 1835, p. 205, pi. 15, fig. 6; Med. Phys. Rea., 1835, p. 400, pi., 

 fig. 6. Green, Suppl. Tril. N. A., 1835, p. 7; Amer. Jour. Sci. Arts, 33, 1838, 

 p. 142, fig. 2. Emmons, Geol. New York, 2, 1842, p. 399, text fig. 1; p. 279, 

 text fig. 1. Vanuxem, ibid., 3, 1842, p. 57, fig. 1. Mather, ibid., 1, 1843, 

 p. 390, fig. 1. Burmeister, Org. Tril., Berlin, 1843, p. 133. Owen, Amer. 



