THA. VER.] 



CCELRNTERATA. 



207 



approximatus, see Graptolithus approxi- 



matus. 



THAMNOGRAPTUS, Hall, 1859, Pal. N. Y., vol. 

 3, p. 519. [Ety. thamnus, shrub ; grapho, 

 I write.] Fronds consisting of straight 

 or flexuous stipes, with alternating or 

 widely diverging branches; branches 

 long, "simple, or ramose, in the same 

 manner as the stipe ; the main stipe 

 and branches are marked by a central 

 longitudinal, depressed line, indicating 

 the axis. Type T. typus. 

 anna, Hall, 1865, Can. Org. Rem., Dec- 

 ade 2, p. 141, Quebec Gr. 

 bartonensis, Spencer, 1878, Can. Nat., vol. 

 8, and Bull. No. 1, Mus. St. Univ. Mo., 

 p. 39, Niagara Gr. 



capillaris, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 520, Hud. 

 Riv. Gr. 



multi form is, 

 Spencer, 1884, 

 Bull. No. 1, 

 Mus. Univ. St. 

 Mo.,p.40,Ni- 

 ajrara Gr. 

 typus, Hall, 

 "1859, Pal. 

 N. Y., vol. 3, 

 p. 519, Hud. 

 Riv. Gr. 



THECIA, Edwards & Haime, 1849, Comptes 

 rend., t. 29, p. 263. [Ety. theke, sheath,] 

 Corallum massive, with an abundant, 

 compact, spurious coenenchyma, pro- 

 duced by the septa becoming cemented 

 together laterally ; septal system highly 

 developed : tabulae numerous ; calices 

 shallow, with a small deep fossula. 

 Type T. swindernana. 



FIG. 226. Thamnograptus 

 typus. 



FIG. 227. Thecia major. 



major, Rominger, 1876, Foss. Corals, p. 



67, Niagara Gr. 



minor, Rominger, 1876, Foss. Corals, p. 



68, Niagara Gr. 



ramosa, Rominger, 1876, Foss. Corals, p. 



69, Up. Held. Gr. 



swindernana, Goldfuss, 1829, (Agaricia 

 swindernana,) Petref. Germ., p. 109, 

 Niagara Gr. 



THBCOSTEGITES, Edwards & Haime, 1849, 

 Comptes rend., t. 29, p. 261. [Ety. 

 theke, sheath ; siege, covering.] Coral- 

 lites cylindrical, short and united by 

 short mural expansions situated at 



various heights : tabulae horizontal. 

 Type T. bouchardi. 



bouchardi, Michelin, 1845, (Harmodites 

 bouchardi,) Icon. Zpoph., p. 185. This 

 species was described from France, 

 and is probably not American. 



FIG. 228. Thecostegites hemisphericus, natural 

 size and magnified. 



hemisphericus, Roemer, 1860, Sil. Fauna 



W. Tenn., p. 25, Niagara Gr. 

 TRACHYPORA, Edwards & Haime, 1851, Pol. 



Foss. d. Terr. Pal., p. 305. [Ety. 



trachys, rough ; poros, pore.] Dendroid ; 



calices slightly salient; no septa; 



coenenchyma abundant, solid, and 



surface marked by strong, irregular, 



vermicular, subechinulated'strise. Type 



T. davidsoni. 

 austini, Worthen, (in press,) Geo. Sur. 



111., vol. 8, p. 81, Coal Meas. 

 elegantula, Billings, 1860, Can. Jour., vol. 



5, p. 254, Ham. Gr. 

 ornata, Rominger, 1876, (Dendropora 



ornata,) Foss. Corals, p. 62, Ham. Gr. 



FIG. 229. Trachypora elegantula. Portion of 

 two corallites a longitudinal section and a 

 corallite enlarged. 



TROCHOPHYLLUM, Edwards & Haime, 1851, 

 Mon. d. Pol. Foss. de Terr. Pal., p. 356. 

 [Ety. trochos, wheel ; phyllon, leaf.] Sim- 

 ple, trochoid; calice shallow; septa 

 thick, not denticulate, extending 

 almost to the center of the visceral 

 chamber, where a small tabula is 

 visible; fossula rudimentary and oc- 

 cupied by a small septum. Type T. 

 verneuilanum. 



verneuilanum, Edwards & Haime, 1851, 

 Mon. d. Pol. Foss. d. Terr. Pal., p. 357, 

 Subcarboniferous. 



Tubipora, Linnaeus, 1758, Syst. Nat., 10th 



Ed., p. 789. Not American Palaeozoic. 



lamellosa, Owen, 1840, Rep. on Min. 



Lands, p. 78. Not denned. Probably 



a Syringopora. 



VERMIPORA, Hall, 1874, 26th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 109. [Ety. vtrmis, 

 worm ; poros, pore.] Ramose ; coral- 

 lites cylindrical, close, increasing by 

 lateral gemmation, and projecting at 

 the surface ; tabulae remote; no mural 

 , pores connecting corallites. Type V. 

 serpuloides. 



