EXPLANATIONS' OF TH!-] PLATES', 539 



PLATE XX. • 



(All tlie interiors are right valves.) 



CyprinidcB. 



Page 



1. Astarte sulcata, Da Costa. Brit 464 



2. Circe corrugata, Cliem. A. Red Sea 464 



3. Isocardia cor. L. \. Brit 466 



4. Cypricardia obesa, Eeeve. \. India 467 



5. Cardita calyciilata, L. S. Africa 471 



6. iyenericardia) ajar, Adans. W. Africa 472 



Venerid(B. 



7. Yeniis paphia, L. W. Indies 473 



8. Cytherea dione, L. f . W. Indies 474 



9. (Merde) picta, Schnm, f . China . . . . , 474 



10. {Trigona) tripla, L. |. W. Africa 474 



11. [Grateloupia) irregiilaris, Baster. f. Miocene, Bor- 

 deaux 474 



12. Artemis exoleta, L. |-. Brit 474 



13. Lucinopsis undata. Pennant sp. Brit 475 



14. Tapes pullastra, Wood, f . Brit 475 



15. Yenerupis exotica, Lam. N. Australia 476 



16. Petricola lithophaga, Eetz. Medit 476 



17. pholadiformis, Lam. f. New York 476 



18. Glaucomya Chinensis, Gray. China 477 



19. Capsula rugosa, Lam. sp. \. N. Australia 481 



