UHI. SCA.] 



MOLLUSCOIDA. 



821 



FIG. 509. Rhinopora 

 frondosa. 



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

 48. [Ety. rhine, file ; poros, pore.] Ex- 

 panded or subcylindrical and hollow ; 

 celluliferous on two sides; cells arranged 

 in quincunx order, roundish or oval, 

 and raised in little pustules over the 

 surface. Type R. verrucosa. 

 curvata, Ringueberg, 1886, Bull. Buf. Soc. 



Nat, Sci., vol. 5, p. 19, Niagara Gr. 

 frondosa, Hall & Whitfield, 1875, Ohio 

 Pal., vol. 2, p. 112, Niagara Gr. 



tuber cu losa , 

 Hall. 1852, Pal. 

 N. Y., vol. 2, 



S, 170, Niagara 

 r. 



tubulosa, Hall, 

 1852, Pal. N.Y., 

 vol. 2, p. 49, 

 Clinton Gr. 

 venosa, Spencer, 

 1884, Bull. No. 

 1, Mus. Univ. 



St. Mo., p. 54, Clinton Gr. 

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



48, Clinton Gr. 

 RHOMBOPORA, Meek, 1872, Pal. Eastern 



Nebraska, p. 141. [Ety. rhombos, rhomb ; 



poros, pore.] Ramose, tubular, cells 



short ; septa none ; corallites radi- 



ating obliquely outward and upward 



on all sides from an imaginary axis ; 



mouths rhombic or rhombic oval, 



and arranged in longitudinal and 



oblique spiral rows ; interspaces thick, 



with minute pores visible in micro- 



scopic sections. Type R. lepidoden- 



droidea. 

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



Hist., vol. 7, p. 31, Kaskaskia Gr. 

 (?) asperrima, Ulricb, (in press,) Geo. Sur. 



111., vol. 8, pi. 70, Keokuk Gr. 

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



111., vol. 8, pi. 70, Keokuk or War- 



saw Gr. 



confluens, see Acanthoclema confluens. 

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



Hist., vol. 7, p. 25, Up. Coal Meas. 

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



111., vol. 8, pi. 71, St. Louis Gr. 

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



111., vol. 8, pi. 70, Burlington Gr. 

 elegantula, Ulrich, 1884, Jour. Cin. Soc. 



Nat. Hist,, vol. 7, p. 33, Kaskaskia Gr. 

 exigua, Ulrich, (in 



press,) Geo. Sur. 111., 



vol. 8, pi. 70, Burling- 



ton Gr. 

 gracilis, Ulrich, (in 



press,) Geo. Sur. 111., 



vol. 8, pi. 70, Burling- 



ton Gr7 

 incrassata, Ulrich, 1888, 



Bull. Denison Univ., 



p 89, 



shales. 

 lepidodendroidea, Meek, 



1872, Pal. Eastern Nebraska, p. 141, 



Up. Coal Meas. 



b 



droidea. 



ohioensis, Ulrich, 1888, Bull. Denison 



Univ., p. 90, Cuyahoga Shales, 

 persimilis, Ulrich, 1884, Jour. Cin. Soc. 



Nat. Hist., vol. 7, p. 30, Kaskaskia Gr. 

 pulchella, Ulrich, 1884, Jour. Cin. Soc. 



Nat, Hist., vol. 7, p. 31, Kaskaskia Gr. 

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



111., vol. 8, pi. 71, St. Louis Gr. 

 (?) spiral!?, Ulrich, (in press,) Geo. Sur. 



111., vol. 8, pi. 71, Keokuk Gr. 

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



111., vol. 8, pi. 45, Ham. Gr. 

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



111., vol. 8, pi. 45, Ham. Gr. 

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



111., vol. 8, pi. 70, Kaskaskia Gr. 

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



111., vol. 8, pi. 70, Kaskaskia Gr. 

 transversal is, Ulrich, (in press,) Geo. Sur. 



111., vol. 8, pi. 71, Keokuk Gr. 

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



vol. 8, pi. 71, Keokuk Gr. 

 wortheni, Ulrich, 1884, Cin. Soc. Nat. 



Hist., vol. 7, p. 32, Kaskaskia Gr. 

 RHOPALONARIA, Ulrich, 1879, Jour. Cin. Soc. 



Nat. Hist,, vol. 2, p. 26. [Ety. ropalon, 



a club.] Cells slender, fusiform, in 



single anastomosing series ; cell mouths 



near the middle of the cells. Type R. 



venosa. 

 pertenuis, see Stomatopora pertenuis. 



FIG. 511. Rhopalonaria venosa. 



venosa, Ulrich, 1879, Jour. Cin. Soc.' Nat. 



Hist., vol. 2, p. 26, Hud. Riv. Gr. 

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

 p. 172. [Ety. sagenella, a little drag- 

 net.] Membranous net incrusting 

 other bodies; cells in parallel or di- 

 verging series, more or less oblong- 

 quadrangular, and separated by a thin 

 lamina. Type S. membranacea. 



ambigun, Walcott, 

 1879, Utica Slate 

 and related for- 

 mations, p. 22, 

 Utica Slate. 



elegans, Hall, 1876, 



28th Rep. N. Y. 

 St. Mus. Nat, 

 Hist., p. 118, Ni- 

 agara Gr. 



membran acea, 

 Hall, 1852, Pal. 

 NY vol 2 p FlG 512. Fngenella elv 

 172, Niagara Gr. gaus " Ma e nlfl e d - 

 SCALARIPORA, Hall, 1881, Bryozoans of Up. 

 Held. Gr., p. 17. [Ety., scalare, ladder; 

 porus, pore.] Irregular groups of tri- 

 angular branches, more or less concave, 

 traversed transversely by sharp, ele- 

 vated laminae at regular distances ; cel- 



