200 



CCELENTERA TA. 



[I'llV. IM)K. 



being confluent, and consequently the 

 calices are not definitely circum- 

 scribed; no exterior walls; interior 

 mural investment well characterized ; 

 center of tabulae presenting a coluinel- 

 lar tubercle. Type P. hennabi. 



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

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



gigas, Owen, 1840, (Astra^a gigas,) Rep. 

 on Mineral lands, p. 70, Devonian. 



hennahi, Lonsdale, 1840, (Astrsea hen- 

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

 Devonian. 



johanni, Hall & Whitfield, 1873, (Smithia 

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

 Hist., p. 234, Chemung (Jr. 



mammillaris, see Strombodes mammillarig. 



multiradiata, Hall c* Whitfield, 1873, 

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

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



Fig. 205.— Phlllipsnstrea verneuli. 



verneuli. Edwards & Haime, 1851, Poly- 



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

 [am. Gr. 

 verrilli, Meek, 1868, (Smithia verrilli,) 

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

 yandelli, 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., 



Fig.206.— Phyllo 

 graptns typus. 



p. 121, Quebec Gr. 



«8W 



am 



loringi. White, 1874, Rep. Invertebrate 

 Foss., p. 9, and Geo. Sur. W. LOOth 

 Mer., vol. 4, p. 51, Quebec (Jr. 

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

 vol., 4, syn. for Graptolithus bigs- 

 byi. 

 typus, Hall, 1858. Rop. 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. [Ft v. 

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

 hemispheric; basal epitheca, con 

 centrica 1 1 y 

 folded ; cali- 

 ces im- 

 mersed; 

 septa rudi- 

 mentary; 

 tabula^ hor- 

 i z on t a I ; 

 walls thin ; 

 cwnench y - 

 ma com- 

 posed of 

 vertical 

 radiate la- 

 mina' uni- 

 ted by 

 smaller 

 horizontal 

 plates. 

 Type P. p* 

 taliformis. 

 follis. Ed- 

 wards & 

 II i i in a . 

 1851, Mon. 

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

 agara Gr. 

 Pleurodictydm, Goldfuss, 1826, Petref. 

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

 dirtyon, net. Corallura discoidal, upper 

 surface convex; corallitcs diverging 

 from the center of the base, polygonal 

 or subcylindrical ; walls thick; moral 

 pores irregular; tabulae 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, Letlue Palae- 

 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 ( Jr. 

 Polydilasma, Hall, 

 1852, Pal. N. Y., 

 vol. 2, syn. for 

 Zaphrentis. 

 turbinatum, see 

 Zaphrentis tur- 

 binata. 



Porites, Lamarck, 1816, Hist, des Anim. sans 

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

 Palaeozoic genus. 



Fig. 207. — Plaxmoporn follis. 

 Natural size, and magnified. 



Fig. 208.— Pleimxlictyum 

 problematlcum. Under 

 side, showing serpula 

 like body. 



