CER. — CLA.] 



MOILUSCOIDA. 



<W 



agellus, Hall, 1867, 28th Rep. N. Y. Mus. 



Nat. Hist., p. 120, Niagara Gr. 

 beani, James, 1885, Jour. Cin. Soc. Nat. 



Hist., vol. 7, p. 23, Hud. Riv. Gr. 

 confluens, Hall, 1876, 28th Rep. N. Y. 



Mus. Nat. Hist., p. 119, Niagara Gr. 

 explanata, Hall, 1879, Desc. New. Spec. 



Fobs., p. 5, and 11th Rep. Ind. Geo. and 



Nat. Hist , p. 245, Niagara Gr. 

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



170, Niagara Gr. 

 huronensis, Nicholson, 1875, Geo. Mag. 



n. s., vol. 2, p. 37, Ham. Gr. 

 imbricata, Hall, 1852, Pal. N. Y., vol. 2, 



p. 169, Niagara Gr. 

 incrustans, Hall, 1852, Pal. N. Y., vol. 2, 



p. 169, Niagara Gr. 

 labecula, Hall, 1876, 28th Rep. N. Y.Mus. 



Nat. Hist., p. 119, Niagara Gr. 

 labeculoidea, Hall, 1883, Rep. St. Geol., pi. 



16, fig. 1-2, and Pal. N. Y., vol. 6, p. 33, 



Low. Held. Gr. 

 maculata, Hall, 1874, 26th Rep. N. Y. Mus. 



Nat. Hist., p. 108, Low. Held. Gr. 

 maxima, Hall, 1874, 26th Rep. N. Y. Mus. 



Nat. Hist., p. 109, Low. Held. Gr. 

 nicholsoni, James, 1875, Int. toCatai. Cin. 



Foss., p. 3, Hud. Riv. Gr. 

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



p. 6, and 11th Rep. Ind. Geo. and Nat. 



Hist., p. 244, Niagara Gr. 



Fig. 466.— CeramoDora ohioensis. Fragment 

 natural size and magnified. 



ohioensis, Nicholson, 1875, Ohio Pal., vol. 

 2, p. 265, Hud. Riv. Gr. 



orbiculata, Ringueberg, 1886, Bull. Buf. 

 Soc. Nat. Hist., vol. 5, p. 19. Not prop- 

 erly defined. 



parvicella, Hall, 1879, 32d Rep. N. Y. St. 

 Mus. Nat, Hist., p. 158, Low. Held. Gr. 



raripora, Hall, 1879, Desc. New Spec. 

 Foss., p. 6, and 11th Rep. Ind. Geo. and 

 Nat. Hist., p. 244, Niagara Gr. 

 Ceramoporella, Ulrich, 1882, Jour. Cin. 

 Soc. Nat. Hist., vol. 5, p. 156, and Geo. 

 Sur. 111., vol. 8, (in press.) [Ety. from 

 Ceramopora.} Incrusting, consisting of 

 one or more thin layers; zocecial tubes 

 short, apertures rounded, direct or ob- 

 lique, and more or less nearly isolated 

 by mesopores. Type C. distincta. 



distincta, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, pi. 39, Hud. Riv. Gr. 



granulosa, Ulrich, (in press,) Geo. Sur. 

 111., vol. 8, pi. 41, Hud. Riv. Gr. 



stellata, Ulrich, (in press,) Geo. Sur. 111., 

 vol. 8, pi. 41, Hud. Riv. Gr. 

 Ceriopora, Goldfus3, 1826, Germ. Petref. 

 [Ety. kerion, honey-comb; poros, pore.] 

 Not a Palaeozoic genus. 



hamiltonensis, see Streblotrypa hamilton- 

 ensis. 



Chainodictyon, Foerste, 1887, Bull. Deni- 

 son Univ., p. 81. Zoaria flabellate, 

 consisting of narrow inosculating 

 branches, poriferous on one side only, 

 the other with concentric or lunate pli- 

 cations. Fenestrules elliptical; zocecia 

 subtubular in two to four alternating 

 series, their apertures rounded and 

 placed at the bottom of sloping areas. 

 Type C. laxum. 



laxum, Foerste, 1887, Bull. Denison Univ., 

 vol. 2, p. 81, Low. Coal Meas. 



Iaxum var. minor, Ulrich, (in press,) Geo. 

 Sur. 111., vol. 8, pi. 62, Low. Coal Meas. 

 Chiloporella, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 157. [Ety. cheUos, 

 edge or lip ; poros, pore ; ella, dim.] 

 Flabellate fronds or compressed 

 branches, from a greatly expanded 

 heavy crust ; zocecial tubes long, very 

 thin-walled, large, and of irregular 

 shape in the axial region ; walls much 

 thickened near the surface ; apertures 

 ovate, the lunariutn conspicuously ele- 

 vated ; mesopores numerous ; dia- 

 phragms few, generally absent. Type 

 C. flabellata. 



flabellata, Ulrich, 1879, (Fistulipora fla- 

 bellata,) Jour. Cin. Soc. Nat. Hist., vol. 

 2, p. 28. Hud. Riv. Gr. 

 Chilotrypa, Ulrich, 1884, Jour. Cin. Soc. 

 Nat. Hist., vol. 7, p. 49. [Ety. cheilos, 

 edge ; trupa, opening.] Ramose, small 

 central tube to which the zocecia are 

 attached ; interstitial spaces vesiculose ; 

 diaphragms wanting, or few. Type C. 

 hispida. 



hispida, Ulrich, 1884, Jour. Cin. Soc. Nat. 

 Hist., vol. 7, p. 50, Kaskaskia Gr. 



ostiolata, Hall, 1852, (Trematopora ostio- 

 lata,) Pal. N.Y., vol. 2, p. 152, Niagara Gr. 

 Clathropora, 

 Hall, 1852, 

 Pal. N. Y., 

 vol. 2, p. 159. 

 [Ety. clath- 

 rum, lattice ; 

 poros, pore.] 

 Reticulate, 

 u nif ormly 

 poriferous on 

 both sides of 

 the bifoliate 

 fronds; aper- 

 tures more 

 or less quad- 

 r an gular , 

 regularly ar- 

 ranged i n 

 parallel se- 

 ries or ob- 

 liquely in 

 quincunx 

 order. Type 

 C. alcicornis. 



al cic o r nis, 



Hall, 1852, Fig. 467.-Clathropora 

 Pal. N. Y., frondosa. 



vol. 2, p. 159, Niagara Gr. 



