CRE. CYS.] 



MOLLUSCOIDA. 



resent the basal articulating sockets of 

 Ptilodictya and Arthroppra, and are not 

 entitled to rank as species. 

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

 111., vol. 8. [Ety. krepis, horseshoe ; 

 poros, pore.] Incrusting, lamellate or 

 massive, with a wrinkled epitheca on 

 the lower side, in one case forming 

 regular hollow branches; surface ex- 

 hibiting, at subregular intervals, mac- 

 ulae of mesopores, appearing as mi- 

 nutely porous or subsoil d elevations or 

 depressions ; zooacia very little oblique, 

 the apertures varying from rhomboidal 

 to subpyriform ; lunarium well marked 

 in perfect examples; best shown in 

 tangential sections; mesopores usually 

 restricted to the maculse ; diaphragms 

 present. Type C. simulans. 

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



111., vol. 8, pi. 40, Hud. Riv. Group, 

 hemispherica, Ulrich, (in press,) Geo. 

 Sur. 111., vol. 8, pi. 40, Hud. Riv. Gr. 

 impressa, Ulrich, 



(in press,) Geo. 



Sur. 111., vol. 8, 



pi. 40, Hud. Riv. 



Gr. 

 simulans, Ulrich, 



(in press,) Geo. 



Sur. 111., vol. 8, 



pi. 39 and 40, 



Hud. Riv. Gr. 

 solida, Ulrich, (in 



press,) Geo. Sur. 



111., vol. 8, pi. 



40, Hud. Riv. Gr. 



Crisinella scro- 



FiG. 468. Crepipora simu- 

 lans. Tangential sec- 

 tion, showing lumirium. 



Crisina xcrobiculata, see 

 biculata. 



CRISINELLA, Hall, 1883, Rep. St. Geol. Def., 

 pi. 26. [Ety. from Crisina.'} Ramose, 

 solid, celluliferous on one side ; cells in 

 oblique, ascending rows from the cen- 

 ter to the margin of the branch ; peri- 

 stpmes prominent; interapertural spaces, 

 with polygonal pits or mesopores. 

 Type 0. scrobiculata. 

 scrobiculata, Hall, 1881, (Crisina scrobicu- 

 lata,) Bryozoans of the Up. Held. Gr., 

 p. 20, and Pal. N. Y., vol. 6, p. 103, Up. 

 Held Gr. 



Oryptopora, Nicholson, 1874, Ann. and Mag. 



Nat. Hist., 4th ser., vol. 13, and Pal. 



Prov. Ont., p. 102. Founded upon a 



cast from the under side of a Fenestella. 



mirabilis, Nicholson. Not a species. 



CYCLOPORA, Prout, 1860, Trans. St. Louis 

 Acad. ScL, vol. 1, p. 574. [Ety. kuklos, cir- 

 cle ; poros, pore.] Discoidal, f rondescent 

 or incrusting; plates sometimes super- 

 posed with subprismatic cells longer 

 than broad, having their sides formed 

 of a minutely porous interstitial net- 

 work, developed from an epitheca 

 marked by transverse bands more or 

 less concentric, separating the bases of 

 the cells; cells shallow and expanded; 

 interstitial cells. Type C. fungia. 

 discoidea, see Proutella discoidea. 



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



111., vol. 8, pi. 68, Keokuk Gr. 

 fungia, Prout, 1860, Trans. St. Louis Acad. 



Sci., vol. 1, p. 577, Keokuk Gr. 

 jamesi, Prout, syn. for Ptilodictya pa- 



vonia. 

 polymorpha, Prout, 1860, Trans. St. Louis 



Acad. Sci., vol. 1, p. 578, Kaskas- 



kia Gr. 

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



111., vol. 8, p. 404. [Ety. dim. of Cy- 



dopora.] Thin discoidal expansion; 



zofficia subtubular, with a succession 



of superior hemisepta in the vestibular 



portion ; irregular mesoppres abundant; 



acanthopores of large size, numerous. 



Type C. spinifera. 

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



111., vol. 8, pi. 69, Keokuk Gr. 

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



vol. 8, pi. 69, Keokuk Gr. 

 CYSTODICTYA, Ulrich, 1882, Jour. Gin. Soc. 



Nat. Hist. vol. 5, p. 152. [Ety. kustis, 



a bladder ; dictyon, net.] Zoarium like 



Stictopora, but with wide interstitial 



spaces occupied with vesicular tissue. 



Type C. ocellata 

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



111. vol. 8, pi. 76, Keokuk Gr. 

 angusta, Ulrich, 1888, Bull. Denison Univ., 



p. 81, Wayerly Gr. 

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



111., vol. 8, pi. 43, Ham Gr. 

 lineata, Ulrich, 1884, Jour. Gin. Soc. Nat. 



Hist. vol. 7, p. 37, Keokuk Gr. 



FIG. 469. Cystodycta ocellata. Natural size and 

 18 diam. 



lineata var. major, Ulrich, (in press,) 



Geo. Sur. 111., vol. 8, pi. 76, St. Louis Gr. 

 lineata, var. stludovici, 



Ulrich, (in press,) Geo. 



Sur. 111., vol. 8, pi. 76, 



St. Louis Gr. 

 nitida, Ulrich, (in press,) 



Geo. Sur. 111., vol. 8, 



pi. 76, Keokuk Gr. 

 ocellata, Ulrich, 1882, 



Jour. Gin. Soc. Nat. 



Hist., vol. 5, p. 170, 



Keokuk Gr. 

 pustulosa, Ulrich, (in 



r>rAs ^ rVn ^nr 111 FlG - 470. Cysto- 



press, ; vjreo. our. ill., (jj c t,y a ocellata 

 vol. 8, pi. 76, Keokuk Tangential sec- 

 Gr. tion showing lu- 



simulans, Ulrich, 1888, narlum - 



Bull. Denison Univ., p. 81, Waverly Gr. 



zigzag, Ulrich, 1888, Bull. Denison Univ., 

 p. 81, Cuyahoga Shales. 



