PHR. POL.] 



MOLLUSCOIDA. 



FIG. 498.- Phiei 

 pora expausa. 



expansa, Hall & Whitfield, 1875, Ohio 

 Pal., vol. 2, p. 114, Niagara Gr. 



explanata, Hall, 1852, 

 Pal. N. Y., vol. 2, p. 

 46, Clinton Gr. 

 multipora, Hall, 1851, 

 Geo. Lake Supp. Land 

 Dist., vol. 2, p. 206, 

 Trenton Gr. 

 ten u is, Hall, 1874, 

 (Escharopora tenuis,) 

 26th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 99, 

 Low. Held. Gr. 

 PHBACTOPORA, Hall, 1881, 

 Trans. Alb. Inst., vol. 

 10, p. 12. [Ety. phrac- 

 tos, inclosed ; poros, 

 pore.] Zoarium ex- 

 planate, free or in- 

 crusting, frequently 

 contorted, cellulifer- 

 pus on one or both faces; surface 

 elevated at irregular intervals into 

 prominent crests ; cells tubular, with- 

 out septa ; intercellular structure vesic- 

 ulose near the base, septate above. Type 

 P. cristata. 



cristata, Hall, 1881, Trans. Alb. Inst., vol. 

 10, p. 12, and Pal. N. Y., vol. 6, p. 99, 

 Up. Held. Gr. 

 cristata var. lineata, Hall, 1887, Pal. N. 



Y., vol. 6, p. 99, Up. Held. Gr. 

 PHYLLODICTYA, Ulricb, 1882, Jour. Cin. 

 Soc. Nat. Hist., vol. 5, p. 153. [Ety. 

 phyllon, leaf; dictyon, net.] Zoarium 

 forming simple, leaf-like expansions, 

 sometimes branched ; cell apertures 

 small, ob- 

 lique, with 

 the lower 

 margin 

 lipped ; in- 

 tersti tial 

 spaces mi- 

 tt u t e 1 y 

 granular or 

 p u n c tate. 

 Type P. 

 frondosa. 

 frondosa, Ulrich, 1882, Jour. Cin. Soc. 



Nat. Hist., vol. 5, p. 174, Trenton Gr. 

 PHYLLOPORA, King, 1849, Ann. and Mag. 

 Nat. Hist,, 2d ser., vol. 3, p. 389. [Ety. 

 phyllon, leaf; poros, perforation.] Zoa- 

 rium like Fenestella, but having cel- 

 lules on the whole of the under surface 

 of the rays in two or more ranges. 

 Type P. ehrenbergi. 

 aspera, Ulrich, (in press,) Geo. Sur. 111., 



vol. 8, pi. 46, Up. Held. Gr. 

 corlicosa, see Subretepora corticosa, 

 ehrenbergi, Geinitz, 1846, (Gorgonia 

 ehrenbergi,) Grundriss, p. 585, Permian 

 Gr. Very doubtfully identified in 

 America, 

 superba, Ulrich, (in press,) Geo. Sur. 111., 



vol. 8, pi. 46 and 55, Ham. Gr. 

 variolata, see Subretepora variolata. 



Phylloporina, Ulrich, syn. for Subretepora. 

 PILEOTRYPA, Hall, 1887, Pal. N. Y., vol. 6, 

 p. xvi. [Ety. piieos, cap; trupa, open- 

 ing.] Distinguished from Lichenalia 

 by having tbe posterior portions of 

 the peristomes strongly elevated and 

 arched, with distinct denticulations in 

 the aperture, which, in the course of 

 growth, form two longitudinal striations 

 along the interior of the cell wall. Type 

 P. denticulata. 



clivulata, Hall, 1881, (Lichenalia clivu- 

 lata,) Trans. Alb. Inst,, vol. 10, p. 9, and 

 Pal. N. Y., vol. 6, p. 83, Up. Held. Gr. 



denticulata, Hall, 1881, (Lichenalia den- 

 ticulata,) Trans. Alb. Inst., vol. 10, p. 

 8, and Pal. N. Y., vol. 6, p. 84, Up. 

 Held. Gr. 



granifera, Hall, 1881, (Lichenalia granif- 

 era,) Trans. Alb. Inst., vol. 10, p. 11, 

 and Pal. N. Y., vol. 6, p. 84, Up. 

 Held. Gr. 



pyriformis, Hall, 1881, (Lichenalia pyri- 

 formis,) Trans. Alb. Inst., vol. 10, p. 

 12, and Pal. N. Y., vol. 6, p. 82, Up. 

 Held. Gr. 



PINACOTRYPA, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, p, 384. [Ety. pinax, plank ; 

 trupa, opening.] Thin, contorted ex- 

 pansions, with a wrinkled epitheca be- 

 low ; zooecia with subcircular apertures, 

 a well-developed granose peristome, 

 thin walls, and, so far as observed, no 

 lunarium ; interspaces wide, occupied by 

 a single series of very large angular 

 mesopores, which never present the ap- 

 pearance of vesicular tissue ; diaphragms 

 horizontal, few in the zocecial tubes, 

 numerous in the mesopores. Type P. 



elegans, Rominger, 1866, (Fistulipora ele- 

 gans,) Proc. Acad. Nat. Sci. Phil., p. 9, 

 Ham. Gr. 

 Pinnatopora, syn. for Glauconome. 



curvata, see Glauconome curvata. 



intermedia, see Glauconome intermedia. 



minor, see Glauconome minor. 



simulalrix, see Glauconome simulatrix. 



subangulata, see Glauconome subangulata. 



tenuiramosa, see Glauconome tenuiramosa. 



vinei, see Glauconome vinii. 



whitei, see Glauconome whitii. 



youngi, see Glauconome younjd. 

 POLYPORA, McCoy, 1845, Garb. Foss. Ireland, 

 p. 206. [Ety. polys, many ; poros, pore.] 

 Zoarium like that of Fenestella, from 

 which it is distinguished by having no 

 median ridge on the celluliferous side 

 of the rays, and in having from three 

 to ten rows of cell openings. Type P. 

 dendroides. 



aculeata, Hall, 1881, (Fenestella aculeata,) 

 Trans. Alb. Inst., vol. 10, p. 21, and 

 Pal. N. Y., vol. 6, p. 157, Up. Held. Gr. 



adnata, Hall, 1881, (Fenestella adnata,) 

 Trans. Alb. Inst., vol. 10, p. 25, and Pal. 

 N. Y., vol. 6, p. 152, Up. Held. Gr. 



albionensis, Spencer, 1884, Bull. No. 1, 

 Univ. St. Mo., p. 55, Niagara Gr. 



