186 



CCELENTERATA. 



[DIP. 



caduceus, Salter, 1853, (Graptolithus 

 caduceus,) Quar. Jour. Geo. Soc., vol. 

 9, p. 87, Quebec Gr. 



FIG. 169. Didymograptus geraiiius. 



geminus, Hisinger, 1840, (Prionotus gemi- 

 nus,) Leth Suecia, Supp. 2, p. 5, pi. 38, 

 Quebec Gr. 



DIPHYPHYLLUM, Lonsdale, 1845, Russ. and 

 Ural Mts., vol. 1, p. 624. [Ety. diphyia, 

 division ; phyllon, leaf.] Corallum sim- 

 ple, composite, increasing by lateral 

 gemmation; corallites tall, cylindrical, 

 connected by epitbecal or radiciform 

 expansions, with each other; central 

 area occupied by tabulae ; circumscribed 

 by an inner wall; exterior vesicular 

 zone occupied by septa, which are con- 

 fined between the outer and inner 

 mural investment; no columella. Type 

 D. conicum. 



adnatum, Hall, 1882, Foss. Corals Niagara 

 and Up. Held Grs., p. 54, and 12th 

 Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



apertum, Hall, 1882, Foss. Corals Niagara 

 and Up. Held. Grs., p. 54, and 12th 

 Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



archiaci, see Crepidpphyllum archiaci. 



arundinaceum, Billings, 1859, Can. Jour., 

 vol. 4, p. 134, Corniferous limestone. 



breve, Hall, 1882, Foss. Corals Niagara 

 and Up. Held. Grs., p, 55, and 35th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 459, 

 Up. Held. Gr. 



csespitosum, Hall, 1852, (Diplophyllum 

 caespitosum,) Pal. N. Y., vol. 2, p. 116, 

 Niagara Gr. 



coralliferum, Hall, 1852, (Diplophyllum 

 coralliferum,) Pal. N. Y., vol. 2, p. 322, 

 Coralline limestone. 



cylindraceum, Hall, 1882, Foss. Corals 

 Niagara and Up. Held. Grs., p. 54, and 

 35th Rep. N. Y. St. Mus. Nat. Hist., p. 

 458, Up. Held. Gr. 



fasciculum, Meek, 1877, U. S. Geo. Sur. 

 40th Parallel, vol. 4, p. 29, Devonian. 



gigas, Rominger, 1876, Foss. Corals, p. 

 125, Niagara Gr. 



gracile, McCoy, 1854, Brit. Pal. Foss.. p. 

 88, Up. Held Gr. 



huronicum, Rominger, 1876, Foss. Corals, 

 p. 121, Niagara Gr. 



rectiseptatum, Rominger, 1876, Foss. 

 Corals, p. 124, Ham. Gr. 



rugosum, Edwards & Haime, 1851, (Eri- 

 dophyllum rugosum,) Pol. Foss. des 

 Terr. Pal., p. 424, Niagara Gr. 



Bimcoense, Billings, 1859, (Eridophyllum 

 simcoense,) Can. Jour., vol. 4, p. 131, 

 Up. Held. Gr. 



stramineum, Billings, 1859, Can. Jour., 

 vol. 4, p. 135, Corniferous Gr. 



strictum, Edwards & Haime, 1851, (Eri- 



dophyllum strictum,) Poll. Foss. des 

 Terr. Pal., p. 424, Up. Held. Gr. 



p. 

 H 



tumidulum, Hall, 1882, Foss. Corals Ni- 

 agara and Up. Held. Grs., p. 55, and 

 12th Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



FIG. 170. Dlphypliyllum stramineum. 



vennori, fillings, 1865, (Eridophyllum 

 vennori,) Can. Nat. and Geo., 2d ser., 

 vol. 2, p. 431, Clinton Gr. 



verneuilanum, Edwards & Haime, 1850, 

 (Eridophyllum verneuilanum,) Brit. 

 Foss. Corals, p. Ixxi, and Pol. Foss. des 

 Terr. Pal., p. 424, Up. Held Gr. 

 DIPLOGRAPTUS, McCoy, 1854, (Diplograpsus,) 

 Brit. Pal. Rocks, p. 3. [Ety. diploos, 

 duplex; grapho, I write.) Stipes 

 simple, flattened, or quadrangular ; 

 cellules, in single series, on the two 

 sides of a double central axis ; cellules 

 oblique, opening toward the apex ; cell 

 denticles prominent, often mucronate. 

 Type D. foliaceus. 



amplexicaulis, Hall, 1847, (Graptolithus 

 amplexicaulis,) Pal. N. Y., vol. 1, p. 

 79, Trenton Gr. 



angustifolius, Hall, 1859, (Graptolithus 

 angustifolius,) Pal. N. Y., vol. 3, p. 

 515, Hud. Riv. Gr. 



ciliatus, Emmons, 1856, Am. Geo., p. 105, 

 Up. Taconic. 



dissimilaris, Emmons, 1856, Am. Geo., p. 

 105, Up. Taconic. 



foliaceous, (?) Murch, 1839, (Graptolites 

 foliaceus,) Murch. Sil. Syst., p. 695, 

 Hud. Riv. Gr. 



