4. Strombidae 71 



5. Cypraeidae, Ovulidae 73 



6. Cassididae and miscellaneous small gastropods 75 



7. Cymatiidae, Tonnidae, Ficidae 77 



8. Muricidae 79 



9. Melongenidae 81 



10. Melongenidae, Fasciolariidae 83 



11. Miscellaneous large gastropods 85 



12. Olividae, Conidae 87 



13. Arcidae, Glycymeridae 89 



14. Mytilidae, Isognomonidae, Pteriidae 91 



15. Pinnidae, Plicatulidae, Pectinidae, Spondylidae, Limidae, 



Anomiidae, Carditidae 93 



16. Ostreidae, Corbiculiidae, Lucinidae 95 



17. Chamidae 97 



18. Cardiidae 99 



19. Veneridae loi 



20. Tellinidae, Mactridae 103 



21. Miscellaneous gastropods and pelecypods 105 



Tables- 



1. Archaeological occurrence and modern distribution of molluscs found 



at lowland Maya sites 37 



2. Archaeological shell from Dzibilchaltun 46 



3. Marine molluscs from Isla Cancun Midden, Quintana Roo, Mexico 57 



Acknowledgments 



The National Geographic Society— Tulane Univer- Educacion Piiblica of Mexico, through the Institute 



sity Program of Research at Dzibilchaltun, of which Nacional de Antropologia e Historia, which will be 



the present studies form a part, operated under the repository of the collections described. Thanks 



grants from the National Science Foundation and for help and guidance are due the late Dr. Eusebio 



the American Philosophical Society. The illustra- Davalos Hurtado, Director of the Instituto, as well 



tions for this paper were prepared and processed as the several Directors of Prehispanic Monuments 



in the National Geographic Society photographic and their Yucatan representatives during our long 



laboratory. period of work. 



All archaeological work has been done under 



contract with, and direction of, the Secretaria de I ^ December l ^66 



