Ptomatis moreirai Clarke 



Fig. I, 2 Exteriors of two examples 



Locality: Ponta Grossa, Brazil 



Nuculites reedi Clarke 



Fig- 3. 4. 5 Sculpture casts showing the sinuous posterior 

 slopes 

 Locality: Ponta Grossa, Brazil 



Nuculites parai Clarke 



Fig. 6, 7 Sculpture casts from the Upper Devonic black shale, 

 near Erere, State of Para, Brazil 



Nuculites sharpei Reed 



Fig. 8 Sculpture casts of both valves 



9, 10 Other examples of the species 

 Locality: Ponta Grossa, Brazil 

 II, 12 A large specimen of this type with rather heavy clavicles 

 but with the sinuous posterior slopes 

 Locality: Pebble island, West Falkland 



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