

PLEIOCENE FOSSILS. 



PLATE XVIII. 



LUCINIDiE. 



Fig. 1. LUCINA CONTKACTA. Interior of right and exterior of left valve, natural size. Page 54. 



" 2. LUCINA ANADONTA. Same views. Page. 55. 



" 3. LUCINA PENNSYLVANIA. Same views. Page 56. 



" 4. LUCINA EADIANS. Interior of right valve. Page 51. 



" 5. Exterior of left valve. In figure 5 the artist has not succeeded in exhibiting the delicate radiating 



lines, which are generally well-defined in good specimens. 



" 6. LUCINA SQUAMOSA. Interior of right valve. Page 51. 



" 1. Exterior of left valve. 



" 8. LUCINA CRIBRARIA. Interior of right valve. Page 58. 



" 9. Exterior of left valve. 



" 10. LUCINA DIVARICATA. Interior of right valve. Page 59. 



" 11. Exterior of left valve. 



" 12. LUCINA COSTATA. Natural size. Page 60. 



" 13. The same magnified. 



" 14. LUCINA CEENULATA. Natural size. Page 60. 



" 15. The same magnified. 



" 16. LUCINA MULTILINEATA. Natural size. Page 61. 



" IT. The same magnified. 



" 18. LUCINA TRISULCATA. Page 62. 



" 19. The same magnified. 



