336 



PLATE XIII 



Pachydictya senilis n. sp. 



1. Tangential section x 20. 



2. Tangential section x 20, near the surface, sliowing tubull. 



3. Longitudinal section x 20. 



Pierce limestone. Murfreesboro, Tenn. 



Rhinidictya salemensis n. sp. 



4. Longitudinal section x 18. 



5. Tangential section x 18. 

 Ridley limestone. Salem, Tenn. 



Rhinidictya lebanonensis n. sp. 



6. Longitudinal section x 18, showing superior septum. 



7. Tangential section x 18. 



Lebanon limestone. Miles Ford, Rutherford Co., Tenn. 



Trigonidictya irregularis n. sp. 



8. Longitudinal section x 18. 



9. Tangential section x 18. 



Lebanon limestone. Christiana, Tenn. 

 (See Plate III) 



