Chonetes hallei Clarke 



Fig. I Internal cast of conjoined valves 



Locality: Spring Point, Falkland islands 



Schizobolus truncatus Hall 



Fig. 2, 3 Brachial and pedicle valves, x 3 



Locality: Upper Devonic black shale of Erere, Para 



Orbiculoidea baini (Sharpe) 



Fig. 4, 5 Pedicle valves, exterior and interior surfaces 

 6, 7 Pedicle and brachial valves, x 2 



8 Enlargement of surface of pedicle valve 

 Locality: Ponta Grossa, Brazil 



Orbiculoidea bodenbenderi Clarke 



Fig. 9, 10 Brachial valves 



11 Pedicle valve 



12 Enlargement of surface of pedicle valve 

 Locality: Ponta Grossa, Brazil 



