Spirifer katzeri Clarke 



Fig I, 2 View of a dorsal valve, showing the elevation of the fold 

 and the number of ribs 

 Locality: Maecurii sandstone, Rio Maecuru, Para 



Spirifer contrarius Clarke 



Fig. 3. 4 Casts of dorsal valves showing sharp, distinct ribs and 

 broadly concave interspaces 

 Locality: Ponta Grossa, Brazil 



Spirifer parana Clarke 



Fig. 5 A dorsal valve with few broadly rounded ribs 

 6 A crushed specimen with similar characters 

 Locality: Ponta Grossa, Brazil 



192 



