. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 814 MOLLUSCOJDA. [PRT— I'll^^. PlO. Bchara offula. amplectans, Hall, 1884, Rep. St. Geol., p- 7, Ham. Gr. cutpei'a, Mall, 1876, ;- ^^r ^- maculata. bi/oliala, syn. for Ptilodictya nebulosa. bilateralis, Hnll, 1883, Rep. St. Geo., pi. 16, fijr. 22-25, Low. Held. Gr. coucentriea, Hall, 1887, Pal. N. Y., vol. 6, p. 67, Low. Held. Gr. foliala, syn. for Piilodictya nebulosa. incrassata, Hall, 1879, 2
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 814 MOLLUSCOJDA. [PRT— I'll^^. PlO. Bchara offula. amplectans, Hall, 1884, Rep. St. Geol., p- 7, Ham. Gr. cutpei'a, Mall, 1876, ;- ^^r ^- maculata. bi/oliala, syn. for Ptilodictya nebulosa. bilateralis, Hnll, 1883, Rep. St. Geo., pi. 16, fijr. 22-25, Low. Held. Gr. coucentriea, Hall, 1887, Pal. N. Y., vol. 6, p. 67, Low. Held. Gr. foliala, syn. for Piilodictya nebulosa. incrassata, Hall, 1879, 28th Rep. N. Y. St. Mus. Nat. HJHt., p 121, Niagara Gr. incrustanH, Hall, 1874, 26th Rep. N. Y. St. Mus. Nat. Hist., p. 107, Low. Held. Gr. intercella. Hall, 1884, Rep. St. Geol., p. 6, Ham. Gr. maculata. Hall, 1876, 28th Rep. N. Y. St. Mus. Nat. Hist., p. 121, Niagara Gr. offnia. Hall, 1876, 28th Rep. N. Y. St. MuB. Nat. Hist., p. 120, Niagara Gr. pertenuis. Hall, 1884, Rep. St. Geol., p. 7. Ham. Gr. radiata, Hall, 1883, Rep. St. Geol., p. 16, fig. 13-14, Low. Held. Gr. reticulata. Hall, 1884, Rep. St. Geol., p. 6, Ham. Gr. sphaerion, Hall, 1876, 28th Rep. N. Y. St. Mus. Nat. Hist, p. 121, Niagara Gr. tenuis, Hall, 1887, Pal. N. Y., vol. 6, p. 36, Low. Held. Gr. variacella. Hall, 1884, Rep. St. Geol., p. 6, Ham. Gr. Pktalotbypa, Ulrich, (in press,) Geo. Sur. 111., vol. 8, p. 377. [Ety. petalog, spread out; trupa, an opening.] Bifoliate, con- sisting of irregular, compressed branches or simple fronds, celluliferous on both sides; zooecial tubes prismatic, arising from a strongly fiexuous mesial line; apertures subcircular or polygonal; mesopore-like interspaces, that do not differ in their tabulation from the zo- oecia, may occur; very small acantho- pores (?) occupy manyoftheangles of junction. Type P. compressa. compressa, Ulrich, (in press,) Geo. Sur. III., vol. 8, pi. 46, Ham. (ir. delicata, Ulrich, (in press,) Geo. Sur. III., vol. 8, pi. 46, Ham. Gr. Petigopoka, Ulrich
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