60 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



Ptilodictya duhia James. (See Arthropora deavelandi. ) 



Ptilodictya fimhriafa James. (See Phxnopora fimbriata.) 



Ptilodictya JfexKona James. (See SlictoporeUa fle.ruom.) 



Ptilodictya grahami James. (See Arthropora deavelandi.) 



Ptilodictya granulosa James. (See Rhinidictya parallela. ) 



Ptilodictya hilli James. ( See Escharopora hilli. ) 



Ptilodictya. kentuckyenm James. (See Arthropora Irntuckyrnsis.) 



Ptilodictya nodosa James. 



Ptilodictya parallela James. (See Rhinidictya parallela. ) 



Ptilodictya 2)latyj>hylla J&uies. (See Phxnopora expansa.) 



Ptilodictya. plnmaria James. 



Ptilodictya teres James. ( See Ptilodictya nodosa. ) 



Ptilodictya ivelshi James. 



Sagenella. striata James. 



Stictopora clathratula James. (See Escharopora. pavonia.) 



Stromatopora ? lichenoides James. 



Stromatopora ludlowensis James. 



Stromatopora tubularis James. 



EXPLANATION OF PLATES. 



Plate I. 



Prasopora falesi (James). 



Figs. 1 and 2. Tangential section, X 20, and portion of same, X 35, showing the 

 usual characters of this species as restricted and here redefined. The 

 small acanthopores which seem to be confined to the vicinity of the 

 maculae are especially characteristic. 

 3 and 4. Vertical section, X 20, and portion of same, X 35, showing the tabu- 

 lation of the zocecial tubes and mesopores and the acanthopores as they 

 appear when cut lengthwise. 



Lexington limestone, Danville, Kentucky. 



('allojKjra multitahnlata ( Ulrich). 



5 and 6. Views of tangential and vertical sections, X 20, drawn from the same 

 sections used by James in attempting to illustrate tlie internal structure 

 of his MonticuUpora keiitnckensis. 



7. A few zo(ecia of fig. 5, X 35, illustrating the minute structure of llic walls. 

 Lexington limestone, Paris, Kentucky. 



Aspidopora calycula (James). 



8 and 9. Tangential section, X 20, and a portion of same, X 35, of an average 



example of this well-marked species. 

 10. Vertical section X 20, showing as usual only a single large cystiphragm at 

 the base of the zoo'cial tubes. 



Bromley shale, Ohio Kiver bank. West Covington, Kentucky. 



Eurydictya midiipora (? Hall) Ulrich. * 



11 and 12. Tangential and vertical sections, X 20, prepared from James's type 

 of Ptilodictya antiqua and showing the usual characters of the species to 

 which it is now referred. 



Lexington limestone, near Ilarrodsburg, Kentucky. 



