ERI. FAV.] 



MOLLUSCOIDA. 



301 



prominent on each side, opening later- 

 ally and alternately. Type E. peran- 

 tiqua. 



cinctosa, Ulrich, 1882, (Mitoclema cinc- 

 tosa,) Jour. Cin. Soc. Nat. Hist,, vol. 5, 

 p. 159, Trenton Gr. 



perantiqua, Hall, 1847, (Gorgonia peran- 

 tiqua,) Pal. N. Y., vol. 1, p. 76, Tren- 

 ton Gr. 



ERIDOPORA, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist,, vol. 5, p. 137. [Ety. eridos, 

 in dispute ; poros, pore.] Zoarium thin, 

 incrusting ; cell-mouths oblique, ovate, 

 or subtriangular, one side more promi- 

 nent than the other, surrounded by 

 angular interstitial cells, which do not 

 form tubes, and may be either open or 

 closed ; intertubular spaces vesicular. 

 Type E. macrostoma. Should this genus 

 prove to be founded upon reliable 

 characters, then many of the parasitic 

 species now placed with Fistulipora 

 will be referred to it. 



macrostoma, Ulrich, 1882, Jour. Cin. Soc. 

 Nat. Hist., vol. 5, p. 137, Kaskaskia Gr. 



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

 p. 21, Up. Held. Gr. 



punctifera, Ulrich, 1882, Jour. Cin. Nat. 



Hist., vol. 5, p. 138, Kaskaskia Gr. 

 Eschara, Lamarck, 1801, Syst. An. sans 

 Vert. [Ety. eschara, scar.] Not Amer- 

 ican Palaeozoic. 



f concentrica, Prout, Trans. St. Louis Acad. 

 Sci., vol. 1, p. 234, Coal Meas. Not 

 recognized. 



ovatipora, Troost, 1840, 5th Geo. Rep. 

 Tenn. Low. Sil. Not recognized. 



reticulata, Troost, 1840, 5th Geo. Rep. 

 Tenn. Low. Sil. Not recognized. 



? tuberculata, Prout, 1858, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 234. Coal Meas. 

 Not recognized. 



ESCHAROPORA, Hall, 1847, Pal. N. Y., vol. 1, 

 p. 72. [Ety. eschara, scar ; poros, pore.] 

 Cylindrical, solid, tapering above, ex- 

 panded and root-like below ; cells oval, 

 inclosed in a rhomboid, by elevated 

 oblique lines ; tubes radiating from an 

 imaginary axis. Type E. recta. 



angusta, Hall, 1879, Desc. New Spec. 

 Foss., p. 6, and llth Rep. Ind. Geo. 

 and Nat. Hist., p. 245, "Niagara Gr. 



lirata, see Ptilodictya lirata. 



nebulosa, see Ptilodictya nebulosa. 



recta, Hall, 1847, Pal. N. Y., vol. 1, p. 73, 

 Trenton Gr. 



recta var. nodosa, Hall, 1847, Pal. N. Y., 

 vol. 1, p. 73, Trenton Gr. 



ienuis, see Phsenopora tenuis. 

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

 111., vol. 8, p. 389. [Ety. eurys, broad ; 

 dwtyon, a net.] Broad, simple, or irregu- 

 larly divided, bifoliate expansions, with- 

 out nonporiferous parallel margins; 

 surface with more or less conspicuous, 

 small, solid maculae or monticules; 

 zocecial structure very much as in Sul- 

 copora, the differences being of small 

 importance, and due to zoarial habit. 



Type E. montifera. Syn. (?) for Pha>- 

 nopora. 



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

 111., vol. 8, pi. 30, Trenton Gr. 



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

 vol. 8, pi. 30, Hud. Riv. Gr. 



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



111., vol. 8, pi. 30, Hud. Riv. Gr. 

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

 111., vol. 8, p. 389. [Ety. euspilos, full of 

 dots ; poros, pore.] Small, bifoliate, lo- 

 bate or irregularly dividing branches; 

 cell apertures subcircular, arranged be- 

 tween longitudinal spinous ridges at the 

 center of the stipe; at intervals several 

 short oblique rows of cells extend out- 

 ward from the central rows to near the 

 margins of the frond; these alternate 

 with concave nonporiferous but finely 

 granular spaces, which do not extend 

 out as far as the celluliferous lobes, 

 and which cause the edges of the frond 

 to be serrate ; internally a vertical row 

 of shfllow vesicles behind the vestibu- 

 lar portion of the zocecia; all the re- 

 maining interspaces traversed by nu- 

 merous minute tubuli. Type E. serrata. 

 Syn. (?) for Stictopora. 



barrisi, Ulrich, (in press,) Geol. Sur. 111., 

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



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



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



EVACTINOPORA, Meek & Worthen, 1865, 

 Proc. Acad. Nat. Sci. Phil., p. 165. 

 [Ety. evactinos, with beautiful rays; 

 poros, pore.] Free, consisting of four or 

 more vertical leaves which radiate from 

 an imaginary axis ; rays thin, cellulif- 

 erous on both sides; in- 

 terstitial spaces occupied 

 by vesicular cells, filled 

 with sclerenchyma, 

 which is traversed by 



canals Type Eradiata. FlG 472 ._ Evac . 

 grandis, Meek & Worthen, tiuoporagran- 

 1868, Geo. Sur. 111., vol. dis. Pores 2 

 3, p. 503, Burlington Gr. dlam - 



quinqueradiata, Ulrich, 

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

 vol. 8, pi. 73, Burling- 

 ton, Gr. 



radiata, Meek & Worthen, 

 1865, Proc. Acad. 



FIG. 473. Evac- 

 tinopora radi- 

 ata. Pores 2 



ilia in 



Nat. 



Sci. Phil., p. 65, and 

 Geo. Sur. 111., vol. 3, p. 

 502, Burlington Gr.. 

 sexradiata, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, p. 502, Burlington Gr. 

 FAVICELLA, Hall, 1887, Pal. N. Y., vol. 6, p. 

 19. [Ety. favus, honey-comb; ellm, 

 diminutive.] Free or incrusting. thin 

 expansion; apertures inclosed in polyg- 

 onal vestibular areas, similar to Selen- 

 opora; intercellular surface occupied 

 by minute mesopores; structure vesic- 

 ulose. Type F. inclusa. 

 inclusa, Hall, 1881, (Thallostigma inclusa,) 

 Trans. Alb. Inst.,- vol. 10, p. 188, and 

 Pal. N. Y., vol. 6, p. 234, Ham. Gr. 



