332 



PLATE XI 



Stromatotrypa laraellata n. sp . 



1. Vertical sectdon x 20, showing supposed layers. 



2. Tangential section x 20. 



Pierce limestone. Murfreesboro, Tenn. 



Stromatotrypa incriistan.s n. sp . 



3. Vertical section x 18. 



4. Tangential section x 18. 



Pierce limestone. Blackman, Tenn. 



Stromatotrypa regularis n. sp. 



5. Tangential section x 18, showing pentagonal-like zooecis 



6. Longitudinal section x 18. 



Pierce limestone. Blackman, Tenn. 



