200 



CCELENTERATA. 



[PHY. POR. 



being confluent, and consequently the 

 calices are not definitely circum- 

 scribed; no exterior walls; interior 

 mural investment well characterized ; 

 center of tabulae presenting a columel- 

 lar tubercle. Type P. hennahi. 



affinis, Billings, 1874, Pal. Foss., vol. 2, 

 p. 11, Gaspe limestone No. 8, Devonian. 



gigas, Owen, 1840, (Astrrea gigas,) Eep. 

 on Mineral lands, p. 70, Devonian. 



hennahi, Lonsdale, 1840, (Astrsea hen- 

 nahi,) Geo. Trans., vol. 5, p. 697, 

 Devonian. 



jobanni, Hall & Whitfield, 1873, (Smithia 

 johanni,) 23d,Rep. N. Y. St. Mus. Nat. 

 Hist., p. 234, Chemung Gr. 



mammillaris, see Strombodes mammillaris. 



multiradiata, Hall & Whitfield, 1873, 

 (Smithia multiradiata,) 23d Rep. N. Y. 

 St. Mus. Nat. Hist,, p. 234, Chemung Gr. 



FIG. 205. Phlllipsastrea verneuli. 



verneuli. Edwards & Haime, 1851, Poly- 

 piers Foss. des Terr. Pal., p. 447, 

 Ham. Gr. 



verrilli, Meek, 1868, (Smithia verrilli,) 

 Trans. Chi. Acad. Sci., p. 83, Devonian. 

 yanddli, Rominger, 1876, Foss. Corals, p. 

 130, Up. Held. Gr. Not well defined. 

 PHYLLOGRAPTUS, Hall, 1858, Rep. of Progr. 

 Can. Geo. Sur. p. 135. [Ety. phyllon, 

 leaf; grapho, I write.] 

 Frond consisting of sim- 

 ple or compound folii- 

 form stipes, which are 

 celluliferous on the two 

 opposite sides, the mar- 

 gins having a mucronate 

 extension from each 

 cellule ; supported on a 

 slender radicle, or com- 

 bined in groups. Type 

 P. typus. 



angustifolius, Hall, 1858, 

 Rep. of Progr. Can. Geo. 

 Sur., p. 139, and Dec. 2. 

 Org. Rem., p. 125, Que- 

 bec Gr. 



anna, Hall, 1865, Can. 

 Org. Rem., Decade 2, p. 

 124, Quebec Gr. 

 dubius, Spencer, 1 884, Bull. 

 No. 1, Mus. Univ. St. 

 Mo., p. 15, Niagara Gr. 

 illicifolius, Hall, 1858, Rep. of Progr. Can. 

 Geo. Sur., p. 139, and Dec. 2, Org. Rem., 

 p. 121, Quebec Gr. 



loringi, White, 1874, Rep. Invertebrate 

 Foss., p. 9, and Geo. Sur. W. 100th 

 Mer., vol. 4, p. 51, Quebec Gr. 



similis, Hall, 1858. Can. Nat. and Geo., 

 vol., 4, syn. for Graptolithus bigs- 

 byi. 



typus, Hall, 1858, Rep. of Progr. Can. 

 Geo. Sur., p. 137, and Dec. 2, Org. 

 Rem., p. 118, Quebec Gr. 

 PLASMOPORA, Edwards & Haime, 1849, 

 Comptes rend., t. 29, p. 262. [Ety. 

 plasma, cast; poros, pore.] Free, sub- 

 hemispheric; basal epitheca, con- 

 centrically 

 folded ; cali- 

 ces im- 

 mersed; 

 septa rudi- 

 mentary ; 

 tabuke hor- 

 i zon t a 1; 

 walls thin ; 

 coanench y - 

 ma com- 

 posed of 

 vertical 

 radiate la- 

 minse uni- 

 t e d by 

 small e r 

 horizontal 

 plates. 

 Type P. pe- 

 taliformis. 



follis, Ed- 



M & a \ * FlG - 2 07 - Plasmopora follis. 

 1 a i m e , Natural size, aud magnified. 

 1851, Mon. 



Pol. Foss. de Terr. Pal., p. 220, Ni- 

 agara Gr. 



PLEURODICTYUM, Goldfuss, 1826, Petref. 

 Germ., vol. 1, p. 209. [Ety pleura, side; 

 dittyon, net. Corallum discoidal, upper 

 surface convex ; corallites diverging 

 from the center of the base, polygonal 

 or subcylindrical ; walls thick; mural 

 pores irregular ; tabulte not numerous, 

 but sometimes inosculating; septa rudi- 

 mentary, in the form of marginal ridges. 

 There is usually a vermiform body at the 

 central part of the base. Type P. prob- 

 lematicum. 



americanum, Roemer, 1876, Lethte Palse- 

 ozoica, pi. 33, figs. 2a and 2b. Ham. Gr. 

 problem a t i c u m , 

 Goldfuss, 1826, 

 Petref. Germ., 

 vol. 1, p. 113, 

 Onondaga Gr. 

 Polydilasma, Hall, 

 1852, Pal. N. Y., 

 vol. 2, syn. for 

 Zaphrentis. 

 turbinatum, see 

 Zaphrentis tur- 

 binata. 



PoriUs, Lamarck, 1816, Hist. desAnim. sans 

 Vert., t. 2, p. 267. Not an American 

 Palaeozoic genus. 



Fio. 208.-Pleurodictyum 

 problematicum. Under 

 side, showing serpula 

 like body. 



