. Bulletin - United States National Museum. Science. Genus PHYLLODICTYA Ulrieh. Phyllodictya Ulrich, Journ. Cincinnati Soc. Nat. Hist., vol. 5,1882, p. 153.—Mil- ler, North Amer. Geol. and Pal., 1889, p. 315.—Ulrich, Geol. Surv. Illi- nois, vol. 8, 1890, p. 390; Geol. and Nat. Hist. Surv. Minnesota, vol. 3, 1893, p. 141; Zittel's Textbook of Paleontology (Eng. ed.), 1896, p. 280.—Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, 1897, p. 531.—NiCKLES and Bassler, Bull. 173, U. S. Geol. Siu:v., 1900, p. 49. The members of this genus differ from other Rliinidictyonidse in
. Bulletin - United States National Museum. Science. Genus PHYLLODICTYA Ulrieh. Phyllodictya Ulrich, Journ. Cincinnati Soc. Nat. Hist., vol. 5,1882, p. 153.—Mil- ler, North Amer. Geol. and Pal., 1889, p. 315.—Ulrich, Geol. Surv. Illi- nois, vol. 8, 1890, p. 390; Geol. and Nat. Hist. Surv. Minnesota, vol. 3, 1893, p. 141; Zittel's Textbook of Paleontology (Eng. ed.), 1896, p. 280.—Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, 1897, p. 531.—NiCKLES and Bassler, Bull. 173, U. S. Geol. Siu:v., 1900, p. 49. The members of this genus differ from other Rliinidictyonidse in having broad, bifoHate zoaria with long zooecial tubes crossed by complete diaphragms and without hemisepta. Its relations are mainly with Pachydidya, but Phyllodictya has more or less strongly oblique apertures with the pos- terior edge raised. Of the two known Russian species, one is identical with an American form, while the second is new. Genotype.—PJiyllo- dictya frondosa Ulrich. Middle Ordovician (Black River) of the United States and Can- ada. PHYLLODICTYA FLABEL- LARIS, new species. Plate 7, figs. 7, 8; text fig. 59. This fine new species differs from all other members of the genus in the greater dimen- sions of both the zoa- rium and zooecia. The zoarium is a broad bifoliate expansion of which figure 7 on plate 7 represents only a fragment. The original of this t5rpe-specimen must have been at least 40 mm. in height and 60 mm. in width, with a maximum thickness of 4 mm. Another specimen before me has a still greater thickness, so that its other dimensions were probably correspondingly larger. The surface of these zoaria is marked by finely granular solid spots or maculas at intervals of about 5 mm. The more perfect condition of the surface shows the zocecia to be arranged in longitudinal series between faintly papillose ridges, but in old examples this arrangement is much obscured. Four zooecia. Please note that these images are extracted from scanned page i
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