1290 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



TRIGONOGRAPTUS Continued. 



Trigonograptus Zittel, Handb. Pal., 1, 1879, p. 302. Koken, Die Leitfossilien, 

 Leipzig, 1896, p. 329. Roeiner and Freeh, Leth. geog.; 1 Theil, Leth. Pal., 1, 

 3 Lief, 1897, p. 624. Ruedemann, Mem. New York State Mus., 7, pt. 1, 1904, 

 pp. 726, 727. 



Trigonograptus ensiformis (Hall). 



Graptolithus ensiformis Hall, Geol. Surv. Canada, Rep. Progr. for 1857, 1858, p. 



133; Canadian Nat. Geol., 3, 1858, p. 167. 

 Retiolites ensiformis Hall, Geol. Surv. Canada, dec. 2, 1865, p. 114ff, pi. 14, figs. 



1-5. Roemer and Freeh, Leth. geog., 1 Thiel, Leth. Pal., 1, 3 Lief., 1897, p. 



667, footnote. 

 Trigonograptus ensiformis Hopkinson and Lapworth, Quart. Jour. Geol. Soc., 31, 



1875, p. 659ff, pi. 34, figs. 8a-c. Ami, Rep. Geol. Surv. Canada, 2d ser., 3, 



pt.2, 1889, p. 117k. Nicholson, Geol. Mag., 3d ser., 7, 1890, pp. 340, 341, figs. 



1, 2. Elles, Quart. Jour. Geol. Soc. London, 54, 1898, pp. 523, 524, fig. 34. 



Ruedemann, Ann Rep. New York State Pal., 1902, p. 571; Mem. New York 



State Mus., 7, pt. 1, 1904, pp. 727-729, pi. 17, figs. 1-9. 

 Canadian: Point Levis, Quebec (Levis, Diplograptus dentatus zone); Deepkill, 



Rensselaer County, and Mount Moreno, New York (Deepkill, D. dentatue 



zone); Arkansas; England (Skiddaw). 



TRIGTRA Raymond. Genotype: T. ulrichi Raymond. 



Trigyra Raymond, Ann. Carnegie Mus., 4, 1908, p. 198. 



Trlgyra ulrichi Raymond. 



Trigyra ulrichi Raymond, Ann. Carnegie Mus., 4, 1908, p. 198, pi. L, fig. 6. 

 Chazyan (Day Point) : Isle La Motte, Vermont. 

 Holotype.Czt. No. 53630, U.S.N.M. 



TRILOBITES ALATUS Boeck. See Sphgerophthalmus alatus. 



TRIMERELLA Billings. Genotype: T. grandis Billings. 



Trimerella Billings, Pal. Fossils, 1, 1862, p. 166. Dall, Amer. Jour. Conch., 6, 1870, 

 p. 160; ibid., 7, 1871, p. 79. Davidson and King, Quart. Jour. Geol. Soc. Lon- 

 don, 30, 1874, p. 143. Dall, Bull. U. S. Nat. Mus., 8, 1877, p. 74. Zittel, 

 Handb. Pal., 1, 1880, p. 668. Miller, N. A. Geol. Pal., 1889, p. 386. Hall and 

 Clarke, Pal. New York, 8, pt. 1, 1892, pp. 33, 46, 163; llth Ann. Rep. New 

 York State Geol., 1894, p. 236. Koken, Die Leitfossilien, Leipzig, 1896, p. 

 231, fig. 190, 3. Schuchert, Zittel-Eastman Textb. Pal., 1, 1900, p. 306; 2d ed., 

 1913, p. 373. Whiteaves, Ottawa Nat., 16, 1902, p. 139. Grabau and Shimer, 

 N. A. Index Fossils, 1, 1907, p. 191. 



Gotlandia Dall, Amer. Jour. Conch., 6, 1870, p. 160. 



Trimerella acuminata Billings. 



Trimerella acuminata Billings, Pal. Fossils, 1, 1862, pp. 167, 168, fig. 152; Amer. 

 Jour. Sci., 3d ser., 1, 1871, p. 471; Ann. Mag. Nat. Hist., 4th ser., 8, 1871, p. 

 140. Dall, Amer. Jour. Conch., 7, 1871, p. 82. Davidson and King, Quart. 

 Jour. Geol. Soc. London, 30, 1874, p. 146, pi. 15, figs. 4-7; pi. 16, figs. 1, 2. 

 Nicholson, Pal. Prov. Ontario, 1875, p. 68, fig. 36. Hall and Clarke, Pal. New 

 York, 8, pt. 1, 1892, pl.4B, fig. 6. Whiteaves, Pal. Foss., Geol. Surv. Canada, 

 3, pt. 2, 1895, p. 54. Grabau and Shimer, N. A. Index Fossils, 1, 1907, p. 191. 



Niagaran: Gait, New Hope, and Hespelar, Ontario; near Hillsboro, Ohio (Guelph); 

 Port Byron, Illinois; Gotland and Faro. 



