320 



Orbignyella nodosa n. sp. 



1. Tangential section x 18. 



2. Longitudinal section x 18. 



Lebanon limestone. Big Springs, Rutherford Co., Tenn. 



Orbignyella multitabulata n. sp. 



3. Longitudinal section x 18. 



4. Tangential section x 18. 



Pierce limestone. Almaville, Tenn. 



Mesotrypa crustulata n. sp. 



5. Tangential section x 20. 



6. Longitudinal section x 20. 



Pierce limestone. Murfreesboro, Tenn. 



