Modiomorpha austronotica Clarke 



Fig. I, 2 Sculpture casts of right and left valves 



3 A right valve 



4 Expanded valves in juxtaposition 

 Locality: Ponta Grossa, Brazil 



Modiomorpha ? scaphula Clarke 



Fig. 5, 6 Right and left sculpture valves 



Localities: Ponta Grossa and Tybagy, Brazil 



Phthonia ? epops Clarke 



Fig. 7 Right valve showing surface characters 

 8 Enlargement of surface on posterior slope 

 Locality: Jaguariahyva, Brazil 



Pholadella of radiata Hall 



Fig. 9 Fragment of a large specimen provisionally referred to 

 this species 

 Locality: Tybagy, Brazil 



Leptodomus ulrichi Clarke 



Fig. 10, II Left valves of this species 



Locality: Ponta Grossa, Brazil 



i8o 



