ECT. ETH.] 



PROTOZOA. 



159 



sponge.] Massive, hemispherical, at- 

 tached with a strong radiating frame- 

 work. Structure vesicular. Type D. 

 insolens. 



insolens, S. A. Miller, 1882, Jour. Gin. Soc. 



Nat. Hist., vol. 5, p. 43, Hud. Riv. Gr. 



minima, Ulrich, 1889, Am. Geol., vol. 3, 



p. 243, Hud. Riv. Gr. 

 minor, Ulrich & Everett, (in press,) Geo. 



Sur. 111., vol. 8, p. 278, Trenton Gr. 

 rudis, Ulrich & Everett, (in press,) Geo. 



Sur. 111., vol. 8, p. 279, Trenton Gr. 

 ECTENODICTYA, Hall, 1884, 35th Rep. N. Y. 

 St. Mus. Nat. Hist,, p. 466. [Ety. ekttmse, 

 stretched out; dictuon, net.] A reticu- 

 late frond irregularly expanded or ex- 

 planate; reticulation irregular present- 

 ing radiating and concentric striae. Type 

 E. implexa. 



hurlingtonensis, Hall, 1884, 35th Rep. N. 

 Y. St. Mus. Nat. Hist., p. 476, Waverly 

 Gr. 



excentrica, Hall, 1884, 35th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 476, Keokuk 

 Gr. 

 expansa, Hall, 1.884, 35th Rep. N. Y. St. 



Mus. Nat. Hist., p. 475, Waverly Gr. 

 implexa, Hall, 1884, 35th Rep. N. Y. St. 



Mus. Nat. Hist., p. 475, Waverly Gr. 

 EDRIOSPONGIA, Ulrich & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 271. [Ety. 

 edrion, a seat ; spongia, sponge.] Mass- 

 ive, lobate, attached by a broad base; 

 sides irregularly dented ; radiating 

 canals, connected by tortuous, vertical 

 ones; minute canals formed by spic- 

 ules ; sides covered with a dermal layer. 

 Type E. basalis. 

 basalis, Ulrich & Everett, (in press,) Geo. 



Sur. 111., vol. 8, p. 272, Trenton Gr. 

 ENDOTHYRA, Phillips, 1845, Proc. Geol. and 

 Poly tech. Soc. W. Riding Yorks., vol. 2, 

 p. 279. [Ety. endos, within ; thura, door.] 

 Free, spiral, rotaliform, segments nu- 

 merous, texture subarenaceous, imper- 

 forate, aperture simple. Type E. bow- 

 mani. 



baileyi, Hall, 1858, (Rotaliabaileyi,) Trans. 

 Alb. Ins., vol. 4, p. 34, and 

 1882, Bull. Mus. Nat. Hist., 

 p. 42, Warsaw Gr. 

 EOSPONGIA, Billings, 1861, Pal. 

 Foss., vol. 1, p. 18. [Ety. 

 eos, dawn ; spongia, sponge.] 

 Subglobular, pyriform or 

 FIG 103 subhemispherical, not free, 



Bndothyra P ores radiating irregularly 



baileyi, from the central axis; cup 



magnified. of variable depth. Type E. 



roemeri. 

 roemeri, Billings, 1861, Pal. Foss., vol. 1, 



p. 19, Chazy Gr. 

 varians, Billings, 1861, Pal. Foss, vol. 1, p. 



19, Chazy Gr. 



EOZOON, Dawson, 1865, Can. Nat. and Geo., 

 2d ser., vol. 2, p. 54. [Ety. eos, dawn ; 

 zoon, animal.] Massive, in large sessile 

 patches or irregular cylinders, growing 

 at the surface, by the addition of suc- 



cessive laminae, internally, the cham- 

 bers are flattened, irregular, with numer- 

 ous rounded extensions, and separated 

 by walls of variable thickness, pene- 

 trated by septal orifices irregularly 

 disposed; thicker parts of the walls 

 with fine branching tubuli ; the ap- 

 pearance to the naked eye is some- 

 thing like Stromatopora. Type E. 

 canadense. 



canadense, Dawson, 1865, Can. Nat. and 

 Geo., 2d ser., vol. 2, p. 54, Laurentian. 

 The most ancient organism. 



FIG. 104. Ezoon canaden 



ETHMOPHYLLUM, Meek, 1868, Am. Jour. Sci. 

 and Arts, 2d ser., vol. 45, p. 62. [Ety. 

 ethmos, sieve ; phyllon, plant.] Body 

 simple, elongate, turbinate, cup-shaped, 

 clavate or cylindro-conical, curved or 

 straight, corrugated, lobed, or ribbed, 

 penetrated by round or oval pores, in 

 vertical or horizontal rows ; vertical 

 septa numerous, originating at the 

 outer wall, and extending to the inner 

 one, poriferous ; inner wall with or 

 without vesicular tissue, extending into 

 the central cup ; series of septa and 

 walls sometimes repeated; spiculse 

 branching. Type E. whitneyi. 

 gracile, Meek, syn. for E. whitneyi. 



FIG. lOo Ethmophyllum profundum. Longitu- 

 dinal and transverse section of a fragment. 



minganense, Billings, 1859, (Petraia min- 

 ganensis,) Can. Nat. and Geol., vol. 4, 

 p. 346, and Pal. Foss., vol. 1, p. 354. 

 Calciferous Gr. Hinde, in 1889, Quar. 

 Jour. Geo. Soc., p. 142, proposed this 

 species as the type of a new genus Ar- 

 chseoscyphia. 



