NicKLEs AND BASSLER.] CATALOGUE OF GENERA AND SPECIES. 381 



Ptilodictya plumea Hall and Simpson. See Stictoporina plunioa (Hall 



and Simpson). 

 Ptilodictya ponderosa Ulrich. 



1888. Ptilodictya ponderosa. Ulrich, American Geologist, I, p. 308. 

 Trenton: Covington, Kentucky. 



Obs. This is a good species belonging to the genus Escharopora, but 

 requires further description before the name can be considered valid. 



Ptilodictya ? punctata Nicholson and Hinde. See Phsenopora punctata 



(Nicholson and Hinde). 

 Ptilodictya ramosa Ulrich. See Escharopora ramosa (Ulrich). 

 Ptilodictya ^ raripora Nicholson and Hinde. See Nematopora raripora 



(Hall)." 

 Ptilodictya retiformis Hall and Simpson. See Stictoporina plumea 



(Hall and Simpson). 

 Ptilodict3'a rudis Foerste. See Pachydictya crassa (Hall). 

 Ptilodictya rustica Billings. See Pachydictya crassa (Hall). 

 Ptilodictya scutulata Hall and Simpson. See Stictoporina scutulata 



(Hall).' 

 Ptilodictya (Stictopora) sereata Meek. See Prismopora? serrata 



(Meek). 

 Ptilodictya Shaffer! Nicholson. See Arthropora shafferi (Meek). 

 Ptilodict3'a (Stictopora) Shafferi Meek. See Arthropora shafferi 



(Meek). 

 Ptilodictya subrecta Ulrich. See Escharopora subrecta (Ulrich). 



Ptilodictya sulcata Billings. 



1866. Ptilodictya sulcata. Billings, Catal. Sil. Fos. Anticosti, p. 35. 

 Anticosti: Anticosti Island. 



Ptilodictya superba Billings. See Ph?enopora superba (Billings). 

 Ptilodictya symmetra Safford. Not recognized. 



1869. Ptilodictya symmetra. Safford, Gael. Tennessee, p. 286. 



Ptilodictya ?? tarda Billings. 



1874. Ptilodictya tarda. Billings, Pal. Foss., II, p. 13. 



Oriskany (Gaspe Limestone): Grand Creve, Canada. 



Ptilodictya ? tenera Billings. 



1866. Ptilodictya tenera. Billings, Catal. Sil. Foss. Anticosti, p. 33. 

 Anticosti: Anticosti Island. 



Ptilodictya tenuis Hall and Simpson. See Phfenopora tenuis (Hall). 

 Ptilodictya teres James. See Ptilodictya nodosa James. 

 Ptilodict^-a triangulata White. See Prismopora triangulata (White). 

 Ptilodict3'a variabilis Ulrich. See Ptilodictya nodosa James. 

 Ptilodictya (Stictopora) variabilis Prout. Not recognized; probably 

 Cystodictva gilberti (Meek). 

 1866. Ptilodictya (Stictopora) variabilis. Prout, Trans. St. Louis Acad. Sci., II, 

 p. 412. 

 Devonian: Columbus, Ohio. 



Ptilodictya welshi James. See Phtenopora multifida (Hall). 



