326 



PLATE VIII 



Hallopora spissata n. sp . 



1. Longitudinal section x 20. 



2. Tangential section x 20. 



Pierce limestone. Murfreesboro, Ward's Mill, Almaville, Tenn. 



Hallopora florencia n. sp. 



3. Longitudinal section x 18. 



4. Tangential section x 18. 



Pierce limestone. Florence, Tenn. 



Batostoma libana (Safford). 



5. Portion of zoarium, natural size. 



6. Longitudinal section x 20. 



7. Tangential section x 20. 



Lebanon limestone, of Central Tennessee. 



