i86 STUDIES IN GEOLOGY, No. 3 



PLATE V. 



Fig. i._ Leda peruviana Dall. 



2,3. Area (Noetia) cholana Spieker. 



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



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



8,9. Area (Scapharca) pantheonensis Spieker. 



10. Area (Scapharca) zapotalensis Spieker. 



11. Area (Scapharca) fissicosta Spieker. 



12. 13. Area (Scapharca) singewaldi Spieker. 



14. Area (Scapharca) vanholsti Spieker. 



15. Area (Scapharca) charonensis Spieker. 

 1.6, 17, 18. Area (Scapharca) larkinii Nelson. 



19,20. Area (Scapharca) imporcata Spieker. 



