336 
PLATE XIII 
Pachydictya senilis n. sp. 
1. Tangential section x 20. 
2. Tangential section x 20, near the surface, showing 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) 
