2 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



ACANTHODICTYA Hinde. Genotype: A. hispida Hinde. 



Acanthodictya Hinde, Trans. Roy. Soc. Canada, 7, sec. 4, 1890, p. 47. Miller, 

 N. A. Geol. Pal., 1st App., 1892, p. 666. Dawson, Trans. Boy. Soc. Canada, 

 2dser., 2, sec. 4, 1896, p. 110. 



Acanthodictya hispida Hinde. 



Acanthodictya hispida Hinde, Trans. Roy. Soc. Canada, 7, sec. 4, 1890, p. 48, 

 figs. 18, 19, pi. 3, fig. 8. Rauff, Palaeontographia, 40, 1894, p. 255. Dawson, 

 Trans. Roy. Soc. Canada, 2d ser., 2, sec. 4, 1896, p. 110, figs. 20, 21, pi. 3, 

 fig. 11. 



Canadian? (Levis?): Metis, Quebec. 



ACANTHOGRAPTUS Spencer. Genotype: A. grant! Spencer. 



Acanthograptus Spencer, Canadian Nat., n. s. 8, 1878, p. 461. Lapworth Quart. 

 Jour. Geol. Soc. London, 37, 1881, p. 174. Spencer, Trans. Acad. Sci. St. 

 Louis, 4, 1884, pp. 562, 581; Bull. Mus. Univ. State Missouri, 1, 1884, p. 31. 

 Miller, N. A. Geol. Pal., 1889, p. 170. Ruedemann, Mem. New York State 

 Mus., 9, 1908, p. 191. 



ACANTHOORAPTUS BARTONENSis Grant. See Acanthograptus walkeri. 



Acanthograptus chaetophorus Gurley. 



Acanthograptus chsetophorus (Gurley MS.) Bassler, Bull. U. S. Nat. Mus., 65, 



1911, p. 61, fig. 84, pi. 3, fig. 5. 

 Niagaran dolomite: Hamilton, Ontario. 



Acanthograptus grant! Spencer. 



Acanthograptus granti Spencer, Canadian Nat., n. s., 8, 1878, p. 461; 10, 1882, p. 



165; Bull. Mus. Univ. State Missouri, 1, 1884, p. 31, pi. 4, fig. 5; Trans. Acad. 



Sci. St. Louis, 4, 1884, p. 581, pi. 4, fig. 5. Gurley, Jour. Geol., 4, 1896, pp. 



92, 308. Ruedemann, Mem. New York State Mus., 11 pt. 2, 1908, pi. 6, 



fig. 3; pi. 7, fig. 3. Bassler, Bull. TJ. S. Nat. Mus., 65, 1909, pp. 56, 57, figs. 



72-74. 

 Niagaran dolomite: Hamilton, Ontario. 



Acanthograptus multlsplnus Gurley. 



Acanthograptus multispinus (Gurley MS.), Bassler, Bull. U. S. Nat. Mus., 65, 



1911, p. 61, figs. 85, 86. 

 Niagaran dolomite: Hamilton, Ontario. 



Acanthograptus pulcher Spencer. 



Acanthograptus pulcher Spencer, Canadian Nat., 10, 1882, p. 165 (nom. mid.); 

 Bull. Mus. Univ. State Missouri, 1, 1884, p. 32, pi. 4, fig. 6; Trans. Acad. 

 Sci. St. Louis, 4, 1884, pp. 564, 582, pi. 4, fig. 6. Miller, N. A. Geol. Pal., 

 1889, p. 170, fig. 128. Gurley, Jour. Geol. 4, 1896, pp. 92, 308. Bassler, 

 Bull. U. S. Nat. Mus., 65, 1909, pp. 59, 60, figs. 81-83, pi. 4, fig. 5. 

 Niagaran dolomite: Hamilton, Ontario. 



Acanthograptus walkeri (Spencer). 



Inocaulis walkeri Spencer, Canadian Nat., 10, 1882, p. 165 (nom. nud.); Bull. 



Mus. Univ. State Missouri, 1, 1884, p. 35, pi. 5, fig. 2; Trans. Acad. Sci. St. 



Louis, 4, 1884, p. 585, pi. 5, fig. 2. Gurley, Jour. Geol., 4, 1896, pp. 99, 309. 

 Acanthograptus walkeri Ruedemann, Mem. New York State Mus., 11, 1908, p. 194, 



figs. 97, 98, pi. 6, figs. 1, 2; pi. 7, fig. 4. Bassler, Bull. U. S. Nat. Mus., 65, 1909, 



pp. 57-59, figs. 75-80. 

 Acanthograptus bartonensis Grant, Jour, and Proc*. Hamilton Assoc., 16, 1900, 



p. 101 (fig. only). 



