t)S. CAL.] 



MOLLUSCOIDA. 



295 



poriferous space in the center of each 

 disk, round which the radiating ridges 

 occupy a slightly elevated zone. Type 

 B. socialis. 



a } 



FIG. 459. Botryllopora socialis. a, Group on coral 

 natural size ; 6, enlarged specimen ; c, enlarged 

 ray to show pores. 



socialis, Nicholson, 1874, Geo. Mag. Lond. 



n. s., vol. 1, p. 160, Ham. Gr. 

 BUSCOPORA, Ulrich, 1886, Cont. to Am. Pal., 

 p. 22. [Ety. Busk, proper name; poros, 

 perforation.] Zoarium thin, lamellate ; 

 incrusting or free; under surface, with 

 a concentrically wrinkled epitheca ; 

 zooecia tubular, short, with subcircular 

 apertures and a faintly elevated border 

 or peristome ; posterior margin, with a 

 tooth-like process divided at its termi- 

 nation ; accessory cells present ; inter- 

 stitial spaces vesiculose ; zooecial tubes, 

 with diaphragms. Type B. lunata. 



dentata, Ulrich, syn. for B. lunata. 



lunata, Rominger, 



(Fistulipora 

 lunata,) P r o c . 

 Acad. Nat. Sci. 

 Phil., p. 7, and Pal. 

 N. Y., vol. 6, p. 77, 

 Up. Held. Gr. 

 lunata var. tubulata, 

 Hall, 1887, (Liche- 

 nalia lunata var. 

 tubulata,) Eep. St. 

 Geol. for 1885, pi. 

 31, and Pal. N. Y., vol. 6. p. 78, Up. 

 Held. Gr. 



BYTHOPORA, Miller & Dyer, 1878, Cont. to 

 Pal. No. 2, p. 6. [Ety. buthos, depths of 

 sea; poros, pore.] Dendroid, branches 

 small, sometimes anastomosing, smooth ; 



FIG. 460. Buscopora lu- 

 nata. Tangential sec- 

 tion, showing aper- 

 ture or lunarium. 



FIG. 461. Bythopora fruticosa. 



cell apertures longer than wide, sej 

 rated by impressed lines. Type 

 fruticosa. 



462. Bythopora 

 nashvillensis. Magni- 

 fied. 



arctipora, Nicholson, 1875, (Ptilodictya 



arctipora,) Ann. and Mag., ser. 4, vol. 



15, p. 180, Utica Slate, 

 delicatula, (?) instead of Monticulipora 



delicatula. 

 fruticosa, Miller & Dyer, 1878, Cont. to 



Pal. No. 2, p. 6, Hud. Riv. Gr. 

 herricki, Ulrich, 1886, 14th Rep. Geo. Sur. 



Minn., p. 99, Trenton Gr. 

 nashvillensis, S. A. 



Miller, 1880, Jour. 



Cin. Soc. Nat. 



Hist., vol. 3, p. 



143, Trenton Gr. 

 striata, Ulrich, (in jf " 



press,) Micropa- 



Iseontology, p. 10, 



Hud. Riv. Gr. 

 C ALLOPORA, Hall, 



1852, Pal. N. Y., 



vol. 2, p. 144. FI 



[Ety. kallos, beau- 

 tiful ; poros, pore.] 



Ramose, smooth, or tuberculated ; ceil 



tubes cylindrical ; interstitial cells nu- 

 merous!; diaphragms numerous, no spini- 



form tubuli; intercellular space occupied 



by septate tubuli. Type C. elegantula. 

 aculeolata, see Ccelocaulis aculeolata. 

 ?aspera,Hall, 1852, Pal. N. Y., vol. 2, p. 



147, Niagara Gr. 

 bipunclata, Hall, 1884, Rep. St. Geol., p. 



15, syn. for Streblotrypa hamiltonensis. 

 bispinulata, see Orthopora bispinulata. 

 cellulosa, Hall, 1883, Rep. St. Geol., pi. 12, 



fig. 7-9, Low. Held. Gr. 

 cervicornis, Hall, 1879, Desc. New Spec. 



Foss., p. 3, and llth Rep. Ind. Geo. 



Sur., p. 238, Niagara Gr. 

 cincinnatiensis, Ulricb, syn. for Leioclema 



occidens. 



diversa, Hall, 1879, Desc. New. Spec. Foss., 

 p. 4, and llth Rep. 

 Ind. Geo. Sur., p. 

 239, Niagara Gr. 

 elegantula, Hall, 1852, 

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

 144, Niagara Gr. 

 ? exsul, Hall, 1876, (Al- 

 veolites exsul,) 28th 

 Rep. N. Y. St. Mus. 

 Nat, Hist., p. 115, 

 Niagara Gr. 

 fistulosa, Hall, 1883, Rep. St. Geol., pi. 12, 



fig. 1-6, Low. Held. Gr. 

 florida, Hall, 1852, Pal. N. Y., vol. 2, p. 



146, Niagara Gr. 

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



p. 75, Up. Held, Gr. 



hemispherica, see Fistulipora hemispherica. 

 heteropora, see Callotrypa heteropora. 

 hyale, see Ccelocaulis hyale. 

 incrassata, see Fistulipora incrassata. 

 incontroversa, Ulrich, 1886, 14th Rep. 



Geo. Sur. Minn., p. 96, Trenton Gr. 

 internodata, see Callotrypa internodata. 

 irregularis, see Ccelocaulis irregularis. 

 laminata, Hall, 1852, Pal. N. Y., vol. 2, p. 



146, Niagara Gr. 



FIG. 463. Callopora 

 exsul. 



