i86 Studies jx Geology, No. 3 



Plate V. 



Fig. I. Leda peruviana Dall. 



2,3. Area (Ncietia) cholana Spieker. 



4,5. Area (Cunearca) zorritensis Spieker, x2. 



6,7. Area (Cunearca) sp. indet. 



8,9. Area (Scapharea) pantheonensis Spieker. 



10. Area (Seapharca) zapotalensis Spieker. 



II. Area (Seapharea) fissicosta Spieker. 

 12.13. Area (Scapharea) singewaldi Spieker. 



14. Area (Seapharca) vanholsti Spieker. 



15. Area (Seapharea) charonensis Spieker. 

 16,17,18. Area (Seapharea) kirkinii Nelson. 



19,20. Area (Scapharea) imporeata Spieker. 



