BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 1289 



Trichophycus silurianum (James). 



Cyathophycus siluriana, James, J. F., Jour. Cincinnati Soc. Nat. Hist., 14, pt. 1, 



1891, p. 64, figs. 5a-c. 

 Maysville (Corryville): Cincinnati, Ohio. 



Observation. — Probably the same as T. lanosum. 



Trlchophycus sulcatum Miller and Dyer. 



Trichophycus sulcatum Miller and Dyer, Contr. to Pal., No. 2, 1878, p. 4, pi. 4, 



fig. 5.— James, Jour. Cincinnati Soc. Nat. Hist., 7, 1884, p. 131, pi. 6, fig. 5; 



ibid., 14, 1891, p. 46. 

 Eden (Economy): Cincinnati, Ohio. 



Trichophycus venosum Miller. 



Trichophycus venosum Miller, Jour. Cincinnati Soc. Nat. Hist., 2, 1879, p. 112, 



pi. 9, figs. 5, 5a; ibid., 7, 1884, p. 131; ibid., 14, 1891, p. 46. 

 Maysville (Fairmount): Cincinnati, Ohio. 



TRICHOSPONGIA Billings. Genotype: T. sericea Billings. 



Trichospongia Billings, Pal. Fobs., 1, Geol. Surv. Canada, 1865, p. 357. — Hinde, 

 Quart. Jour. Geol. Soc. London, 45, 1889, p. 145.— Miller, N. A. Geol. Pal., 

 1889, p. 166.— Raurf, Paheontographica, 40, 1894, p. 242. 



Trichospongia hystrix Whiteaves. 



Trichospongia hystrix "Whiteaves, Pal. Foss. Geol. Surv. Canada, 3, pt. 3, 1897, 



p. 147, pi. 17, fig. 3. 

 Black River or Richmond: Cat. Head, Lake Winnipeg, Canada. 



Trichospongia sericea Billings. 



Trichospongia sericea Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, pp. 356, 

 357. — Bornemann, Verst. Cambr. Sardin. N. Act. Leop. Carol. Akad. Naturf., 

 51, 1886, p. 33.— Hinde, Quart. Jour. Geol. Soc. London, 45, 1889, p. 145.— 

 Rauff, Pakeontographica, 40, 1894, p. 242. 



Canadian (Romaine): Mingan Islands, Canada. 



Trigonocephalus Zenker. See Conocephalites Zenker. 



TRIGONODICTYA Ulrich. Genotype: Pachydictya conciliatrix Ulrich. 



TrigonodictyaUlrich, Geol. Minnesota, 3, 1893, p. 160. — Nicklesand Bassler, Bull. 

 IT. S. Geol. Surv., 173, 1900, p. 49. 



Trigonodictya conciliatrix (Ulrich). 



Pachydictya conciliatrix Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minne- 

 sota, 1886, p. 76. 



Trigonodictya conciliatrix Ulrich, Geol. Minnesota, 3, 1893, p. 160, pi. 9, figs. 11, 

 12; pi. 10, figs. 15-20. 



Black River (Decorah): Cannon Falls, Minnesota. 



Coty pes. —Cat. No. 43596, U.S.N. M. 



Trigonodictya catonensis Ulrich. 



Trigonodictya eatonsis Ulrich, Geol. Minnesota, 3, 1893, p. 160. — Foerste, Geol. 



Surv. Ohio, 7, 1895, p. 599. 

 Upper Medinan (Brassfield): Eaton, Ohio. 

 Cotypes — Cat. No. 43595, U.S.N.M. 



TRIGONOGRAPTUS Nicholson. Genotype: T. lanceolatus Nicholson. 



Trigonograpsus Nicholson, Ann. Mag. Nat. Hist., 4th ser., 4, 1869, p. 231; Mon. 

 British Grapt., 1872, p. 122. 



