PLEIOCENE FOSSILS. 



PLATE XX. 



ASTARTID^.-CORBULlDvE.-CYCLASID^. 



ASTAETIDJl. 



Fig. 1. ASTARTE UNDULATA. Common variety, natural size. Page 10. 



" 2. Another variety, natural size. 



" 3. ASTAETE CONCENTRICA. Interior of right and exterior of left valve, natural size. Page 11. 



" 4. ASTARTE LUNULATA. Natural size. Page 12. 



" 5. ORASSATELLA UNDULATA. Interior of right valve, natural size. Page 13. 



" 6. Exterior of right valve, natural size. 



" 1. Young shell, natural size. 



" 8. Variety of Ceassatella undulata, natural size. 



" 9. CRASSATELLA GIBBESII. Exterior of left valve, natural size. Page 14. 



" 10. Young shell. 



CORBULIDiE. 



Fig. 11. CORBULA CUNEATA. Natural size. Page 15. 

 " 12. CORBULA INEQUALE. Natural size. Page 16. 

 " 13. PANDORA TRIL1NEATA. Natural size. Page 16. 



OYCLASIDJ1. 

 Fig. 14. CYRENA DENSATA. Interior of right and exlerior of left valve, natural size. Page 11. 



