428 BULLETIN 92^ UNITED STATES NATIONAL MUSEUM. 



DiCTYOPHYTRA? Walcotti Rauff. >See Cyathophyciis walcotti. 



DICTTORHABDUS Walcott. Genotype: D. prise us Walcott. 



Dictyorhabdiis Walcott, BiilL Geol. Soc. Amer., 3, 1892, p. 165. 



Dictyorhabdus priscus Walcott. 



Dictyorhabdxis 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 RETicui-ATUM 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 stroma toporoid, but is a coral closely allied 



if not identical with Coenites. 



DictyostromX reticulatum Wliiteaves. See Ceramoporella reticulata. 



Dictyostroma undulatum Nicholson. 



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



Nicholson and Jhirie, 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. ]5, figs. 3, 4, 7, 8. 

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



p. 55. 

 Milleria laminata Davis, Kentucky Fossil Corals, Geol. Surv. Kentucky, pt. 2, 



1885, pi. 46, fig. 9. 

 Niagaran (Louisville): Louisville, Kentucky. 



DiDYMooRAPSus Pictct. See Didymograptus McCoy. 



DiDYMOGRAPSus CADUCEUS Salter. See Tetragraptus serra and T. similia. 



DiDYMOGRAPSUS coNVEXUs Gurley. See Didymograptus sagittariiis. 



DiDYMOGRAPSUS uiVARiCATUS. See Dlcollograptus diviiricatus. 



DiDYMOGRAPSUS GEMiNUs Xicliolsuii. Soc 1 >idymograplus luimis. 



DiDYMOGRAPSUS MURCHisoNi FURCiLLATus (iiirley. See Didymograptus furcillarus. 



DIDYMOGRAPTUS McCuy. Genotype: D. murchisoni McCoy. 



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

 dian Jour., n. B., 1, 1856, p. 389.— Pictet, Traits de Pal., 2d ed., 4, 1857, p. 

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

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

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



