426 BULLETIN 92, UIHTED STATES NATIONAL MUSEUM. 



Dictyonema polymorphum — Continued. 



Calyptograptus subretiformis Spencer (part), Trans. Acad. Sci. St. Louis, 4, 1884^ 

 pi. 4, fig. 2; Bull. Mus. Univ. State Missouri, 1, 1884, pi. 4, fig. 2. 



Dictyonema polymorphum (Gurley MS.) Ruedemann, Mem. New York State 

 Mus., 11, 1908, p. 158, pi. 2, fig. 3; pi. 3, figs. 4, 5, 6; p. 160, figa. 60-72.— 

 Bassler, Bull. U. S. Nat. Mua., No. 65, 1909, p. 24, pi. 4, fig.ll. 



Niagaran: Hamilton, Ontario; Middleport, New York (Rochester). 



Holotype.—C&t. No. 54278, U.S.N .M. 



Dictyonema quadrangulare (Hall). 



Dictyonema quadrangularis Hall, Geol. Sur\^ Canada, dec. 2, 1865, p. 138, pi. 20, 



fig. 5.— Matthew, Trans. Royal Soc. Canada, 10, sec. 4, 1893, p. 96. 

 Canadian: Point Levis, Quebec (Levis, Clonograptus zone); St. John, New 

 Brunswick (Bretonian — Div. C3d). 



Dictyonema rectilineatum Ruedemann. 



Dictyonema n. sp. Ruedemann, New York State Pal. Ann. Rep., 1902, p. 570. 

 Dictyonema rectilineatum Ruedemann, Mem. New York State Mus., 7, pt. 1, 



1904, pp. 607-609, pi. 3, figs. 9, 10, text fig. 29. 

 Canadian: Deepkill, Rensselaer County, New York (Deepkill, Diplograptua 



dentatiis zone); Point Levis, Quebec (Levis, dentatus zone). 



Dictyonema retiforme (Hall). 



Gorgonia? reteformis Hall, Rep. Surv. 4th Geol. Dist. New York, 1843, p. 115, 

 fig. 1. — Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 260, figs. 



Dictyonema retiformis Hall, Pal. New York, 2, 1852, p. 174, pi. 40F, fig. la, b.— 

 Lincklaen, 14th Rep. New York State Cab. Nat. Hist., 1861, p. 55, pi. 7, 

 fig. 1.— Hall, Geol. Surv^ Canada, dec. 2, 1865, p. 12, fig. 10; 20th Rep. New 

 York State Cab. Hist., 1868, p. 178, fig. 11; rev. ed., 1870, p. 210, fig. 11; p. 

 225.— Nicholson, Mon. British Grapt., 1872, p. 129, fig. 69.— Zittel, Handl). 

 Pal., 1, 1879, p. 289, fig. 195.— Spencer, Bull. Mus. Univ. State Missouri, 

 1, 1884, p. 14, 23, 24, pi. 3, figs. 1, la, 2, 2a; Trans. Acad. Sci. St. Louis, 4, 1884, 

 p. 573, pi. 3, fig. 1, 2.— Miller, N. A. Geol. Pal., 1889, p. 185, text fig. 168.— 

 Pocta, Syst. Sil. Centre Boheme, 8, 1894, p. 192, 193.— Gurley, Jour. Geol., 4, 

 1896, pp. 96, 308.— Roemer and Freeh, Leth. geog., 1 Theil, Leth. Pal., 1, 3 

 Lief., 1897, p. 575, fig. 145.— Grabau, Bull. Buffalo Soc. Nat. Sci., 7, 1901, p. 

 133, fig. 27; Bull. New York State Mus., 45, 1901, pp. 133, 134, fig. 27.— 

 Grabau and Shimer, N. A. Index Fossils, 1, 1906, p. 25, fig. 33. — Ruedemann, 

 Mem. New York State Mus., 11, 1908, p. 155, fig. 64, pi. 3, fig. 1.— Bassler, 

 Bull. U. S. Nat. Mus., 65, 1909, pp. 18, 19, figs. 19, 20. 



Clinton (Rochester): Rochester, Lockport, etc., New York; Hamilton. Ontario. 



Dictyonema robustum Hall. 



Dictyonema robusta Hall, Geol. Sur\-. Canada, dec. 2, 1865, p. 137, pi. 20, figa. 3, 4. 

 Canadian (Levia, Clonograptus zone): Point Levis, Quebec. 



Dictyonema scalariforme Foerste. 



Dictyonema scalariforme Foerste, Bull. Sci. Lab. Denison Univ., 2, pt. 1, 1887, p. 

 108, pi. 8, figs. 28, 29; Geol. Surv. Ohio, Pal., 7, 1893, p. 600, pi. 27, figs. 28, 

 29.— Gurley, Jour. Geol., 4, 1896, p. 308.— Ruedemann, Mem. New York 

 State Mus.," 11, pt. 2, 1908, p. 153, pi. 1, fig. 3, text figs. 61-63. 



Upper Medinan (Brassfield) : Soldiers Home, Dayton, Ohio. 



Clinton shale: Near Clinton, New York. 



Dictyonema sociaxe Salter. See Dictyonema flabelliforme. 



