1070 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



PTILODICTTA— Continued. 



Escharopora (not Hall, 1847), Hall, 26th Ann. Rep. New York State Mua., 1874, 

 p. 99; 32d Ann. Rep. New York State Mus., 1879, p. 161. 



Heterodictya Nicholson, Geol. Mag., n. a., 2, 1875, p. 33; Pal. Province Ontario, 

 1875, p. 79.— Zittel, Handb. Pal., 1, 18S0, p. 604.— Vine, Rep. 51st Meeting 

 British Assoc. Adv. Sci., 1882, p. 166.— Miller, N. A. Geol. Pal., 1889, p. 309. 



Ptilodictya (part) of authors. See Escharopora Hall and Ptilotrypa Ulrich. 



Ptilodictya acuminata James. See Escharopora acuminata. 



Ptilodictya acuta Nicholson. See Pachydictya acuta. 



Ptilodictya Alcyone Billings. See Pachydictya crassa. 



Ptilodictya angusta (Hall). 



Escharopora (Ptilodictya) angusta Hall, Trans. Albany Inst., 10, 1883, p. 62 

 (abstract, 1879, p. 6); 11th Ann. Rep. Indiana Geol. Nat. Hist., 1882, p. 245. 

 Ptilodictya angusta Nickles and Bassler, Bull. U. S. Geol. Surv., 173, 1900, p. 377. 

 Niagaran ( Waldron) : Waldron, Indiana. 



Ptilodictya antiqua James. See Eurydictya multipora. 



Ptilodictya? arctipora Nicholson. See Bythopora arctipora. 



Ptilodictya arguta Billings. See Pachydictya crassa. 



Ptilodictya bipunctata Lesley. See Phoenopora expansa. 



Ptilodictya briareus Ulrich. See Escharopora briareua. 



Ptilodictya canadensis Billings. 



Ptilodictya canadensis Billings, Cat. Sil. Foss. Anticosti, 1866, p. 9. 

 Richmond (Charleton): Charle ton Point, Anticosti. 



Ptilodictya? cincinnatiensis James. See Arthropora cincinnatiensis. 



Ptilodictya cleavelandi James. See Arthropora cleavelandi. 



Ptilodictya clintonensis James. See Ptilodictya nodosa. 



Ptilodictya crassa Nicholson and Hinde. See Pachydictya crassa. 



Ptilodictya cruciformis D'Orbigny. See Escharopora falciformis. 



Ptllodictya dubia James. See Arthropora cleavelandi. 



Ptilodictya elegantula Emmons. See Stictopora elegantula. 



Ptilodictya emacerata Nicholson. See Dicranopora emacerata. 



Ptilodictya enslpormis Ulrich. See Phsenopora ensiformis. 



Ptilodictya excellens Billings. See Phamopora excellens. 



Ptilodictya expansa Hall. 



Ptilodictya expansa Hall (part), 12th Ann. Rep. Indiana Geol. Nat. Hist., 1883, 

 pi. 12, figs. 2, 3 (but not description on p. 266= Phsenopora expansa Hall and 

 Whitfield).— Foerste, Bull. Sci. Lab. Denison Univ., 2, 1887, p. 155; ibid., 

 3, 1888, pi. 15, fig. 5; Proc. Boston Soc. Nat. Hist., 24, 1889, p. 327.— Lesley, 

 Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 826, figs.— Ulrich, Geol. Surv. 

 Illinois, 8, 1890, fig. lie (p. 391).— Nickles and Bassler, Bull. U. S. Geol. 

 Surv., 173, 1900, p. 378. 



