378 AMERICAN FOSSIL BRYOZOA. [bull. 173. 



Ptilodictya crassa Nicholson and Hinde. See Pachydictya crassa 

 (Hall).^ 



Ptilodictya cruciformis d'Orbigny (not defined). See Escharopora 

 falciformis (Nicholson). 



Ptilodictya (Stictopora?) dictyota Meek. See Coscinium dictyotuni 

 (Meek). 



Ptilodictya dubia James. See Arthropora shafferi-cleavelandi (James). 



Ptilodictya emacerata Nicholson. See Dicranopora emacerata (Nichol- 

 son). 



Ptilodictya ensiformis Ulrich. See Ph^nopora ? ensiformis Hall. 



Ptilodictya excellens Billings. See Phasnopora excellens (Billings). 



Ptilodictya expansa Hall (in part). See Pheenopora expansa Hall and 

 Whitfield. 



Ptilodictya expansa Hall. 



1883. Ptilodictya expansa (in part). Hall, Twelfth Ann. Rep. Indiana Geol. 



Nat. Hist., pi. xii, 2, 3 (but not description on p. 266^Phsenopora expansa 



Hall and Whitfield). 

 1887. Ptilodictya expansa. Foerste, Bull. Sci. Lab. Denison Univ., II, p. 155; 



ibid.,111, 1888,pl. xv,5. 



1889. Ptilodictya expansa. Foerste, Proc. Boston Soc. Nat. Hist., XXIV, p. 327, 



1890. Ptilodictya expansa. Ulrich, Geol. Sur. Illinois, VIII, fig. lie ( p. 391 ) . 

 1895. Ptilodictya lanceolata var. Americana. Foerste, Geol. Sur. Ohio, VII, 



p. 598, pi. xxxvi, ^a-b. 

 Clinton: Dayton and Todds Fork, Ohio; Cumberland Gap, Tennessee. 

 (Foerste). 



Ptilodictya expansa-emarcescens Foerste. 



1889. Ptilodictya expansa var. emarcescens. Foerste, Proc. Boston Soc. Nat. 



Hist., XXIV, p. 328, pi. vi, 30. 

 1895. Pachydictya emarcescens. Foerste, Geol. Sur. Ohio, VII, p. 599, pi. xxxi, 30. 

 Clinton: Eaton, Ohio. 



Obs. This form may prove to ])e young examples of Ptilodictya expansa . 

 Hall. 

 Ptilodictya explicans Safford. Not recognized. 



1869. Ptilodictya explicans. Safford, Geol. Tennessee, p. 286. 

 Ptilodictya falciformis Nicholson. See Escharopora falciformis (Nichol- 

 son). 

 Ptilodictya famelicus Foerste. See Pachydictya ? famelica (Foerste). 

 Ptilodictya farctus Foerste. See Pachydictya crassa (Hall). 

 Ptilodictya fenestelliformis Nicholson. See Pachydictya fenestelli- 



formis (Nicholson). 

 Ptilodictya fimbriata James. See Phgenopora fimbriata (James). 



Ptilodictya flagellum Nicholson, 



1875. Ptilodictya flagellum. Nicholson, Ann. Mag. Nat. Hist, ser. 4, XV, p. 179, 



pi, xiv, 3-36. 

 1875. Ptilodictya flagellum. Nicholson, Pal. Ohio, II, p. 262, pi. xxv, 4-46. 

 Cinciimati (Richmond): Near Lebanon, Ohio. 

 Obs. Ptilodictya nodosa James may be a synonym of this species. 



Ptilodictya flexuosa James. See Stictoporella flexuosa (James). 



