Fig. 



Fie. 



Fig. 



Fis. 



Fig. 



Fig. 

 Fig. 

 Fig. 



Plate III. 



Goniomya uniangulata. 

 1. — Left valve. 



Goniomya transversicostata. 

 2. — Enlarged four diameters. — Part of left valve. 



Trigonia flexicostata . 

 3. — Cast of interior of left valve. 



Trigonia recticostata. 

 4. — Cast of interior of left valve. 



Trigonia paucicostata. 

 5. — Cast of interior of left valve. 



Terebratula grahamensis. 



6a. — Cast of interior of pedicle valve. 



6b. — Cast of interior of brachial valve, part of shell remains on anterior margin. 



6c. — Left lateral view of cast. 



Rhynchonella undulata. 



Fig. 7a. — Left lateral view. 

 Fig. 7b. — Pedicle valve. 

 Fig. 7c. — Brachial valve. 



Fig. 

 Fig. 



Fig. 

 Fig. 

 Fig. 



8a. — Pedicle valve. 

 8b. — Brachial valve. 



Rhynchonella non-sinuata. 



Rhynchonella mag nicostata . 



9a. — Cast of interior. Left lateral view. 



9b. — Cast of interior. Pedicle (ventral) valve. 



9c. — Cast of interior. Brachial or dorsal side, showing median septum. 



