428 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



DICTYOPHYTRA? WALCOTTi Rauff. See Cyathophycus walcotti. 



DICTTORHABDUS Walcott. Genotype: D. priscus Walcott. 



Dictyorhabdus Walcott, Bull. Geol. Soc. Amer., 3, 1892, p. 165. 



Dictyorhabdus priscus Walcott. 



Dictyorhabdus priscus Walcott, Bull. Geol. Soc. Amer., 3, 1892, p. 165, pi. 3, 



figs. 1-5. 

 Black River (Harding) : Canon City, Colorado. 



DICTYOSTOMA Spencer. See Dictyostroma Nicholson. 

 DICTYOSTOMA RETicuLATUM Spencer. See Ceramoporella reticulata. 



DICTYOSTROMA Nicholson. Genotype: D. undulatum Nicholson. 



Dictyostroma Nicholson, Pal. Ohio, 2, 1875, p. 254. Nicholson and Murie, Jour. 



Linn. Soc. London, Zool., 14, p. 224. Zittel, Handb. Pal.. 1, 1879, p. 286. 



Dawson, Quart. Jour. Geol. Soc. London, 35. 1879, p. 56. Nicholson, Mon. 



British Strom., Pal. Soc., 1886, p. 85. Waagen and Wentzel. Mem. Geol. 



Surv. Indica, Pal. Indica, 13th ser., 1, 1888, p. 944. Miller, N. A. Geol. Pal., 



1889, p. 158. Parks, Univ. Toronto Studies, Geol. Ser., 5, 1908, p. 56. 

 Dictyostoma Spencer, Trans. Acad. Sci. St. Louis, 4, 1884, p. 601; Bull. Mus. 



Univ. State Missouri, 1, 1884, p. 51. 

 Milleria Davis, Kentucky Fossil Corals, Geol. Surv. Kentucky, pt, 2, 1885, expl. 



of pi. 46 (Genotype: M. laminata Davis). 

 Observation. Dictyostroma is not a stromatoporoid, but is a coral closely allied 



if not identical with Coenites. 



DICTYOSTROMA RETICULATUM Whiteaves. See Ceramoporella reticulata. 



Dictyostroma undulatum Nicholson. 



Dictyostroma undulatum Nicholson, Pal. Ohio, 2, 1875, p. 254, pi. 24, figs. 6, 6c. 



Nicholson and Murie, Jour. Linn. Soc. Zool., 14, 1878, p. 224. Miller, N. A. 



Geol. Pal., 1889, p. 158, fig. 101. Nicholson, Mon. British Strom., 1892, pp. 



85, 232. Parks, Univ. Toronto Studies, Geol. Ser., 5, 1908, p. 57, pi. 14, figs. 



3, 4; pi. 15, figs. 3, 4, 7, 8. 

 Alveolites stromatoporoides Rominger, Proc. Acad. Nat. Sci. Philadelphia, 1886, 



p. 55. 

 Milleria laminata Davis, Kentxicky Fossil Corals, Geol. Stiirv. Kentucky, pt. 2, 



1885, pi. 46, fig. 9. 

 Niagaran (Louisville): Louisville, Kentucky. 



DIDYMOGRAPSUS Pictet. See Didymograptus McCoy. 



DIDYMOGRAPSUS CADUCEUS Salter. See Tetragraptus serra and T. similis. 



DIDYMOGRAPSUS CONVEXUS Gurley. See Didymograptus Sagittarius. 



DIDYMOGRAPSUS DIVARICATUS. See Dicellograptus divaricatus. 



DIDYMOGRAPSUS GEMINUS Nicholson. See Didymograptus nanus. 



DIDYMOGRAPSUS MURCHISONI FURCILLATUS Gurley. See Didymograptus furcillatus. 



DIDYMOGRAPTUS McCoy. Genotype: D. murchisoni McCoy. 



Didymograpsus McCoy, British Pal. Fossils, pt. 2, 1851, p. 9. Chapman, Cana- 

 dian Jour., n. s., 1, 1856, p. 389. Pictet, Traite" de Pal., 2d ed., 4, 1857, p. 

 474. Nicholson, Quart. Jour. Geol. Soc. London, 24, 1868, p. 9, 138. Car- 

 ruthers, Geol. Mag., 5, 1868, pp. 73, 128. Nicholson, Ann. Mag. Nat. Hist., 

 4th ser., 5, 1870, p. 337; Mon. British Grapt., 1872, p. 103. 





