312 
PLATE I 
Ceramoporella ingenus Ulrich and Bassler. 
1. Vertical section x 20. 
2. A portion of the surface x 10. 
3. Tangential section x 20. 
Pierce limestone, Murfreesboro, Tenn. 
Ceramoporella grandis Ulrich and Bassler. 
4 and 5. Tangential sections x 20, showing the proiminent lunaria‘ 
6. A portion of the surface x 10. 
Pierce limestone, Murfreesboro, Tenn. 
