CLASS I 



RANGE OF THE PELECYPODA 



505 



Families. 



s 



O I Ä 



D. ISODONTA 



Superfamily 7. Pectiih 



33. Pectinidae 



34. Spondylidae 



35. Dimyidae 



36. Limidae . 

 Superfamily 8. Anomiacea 



37. Anoraiidae 



E. Dysodonta 

 Superfamily 9. Mytüacea 



38. Modiolopsidae 



39. Mytilidae 



40. Dreissensiidae 



Order 2. Anomalodesmacea 

 Superfamily 1. Anatinacea 



A. Eusiphonia 



1. Pleuromyacidae 



2. Pholadellidae . 



3. Pholadomyacidae 



4. Anatinidae 



5. Periplomatidae 



6. Thraciidae 



7. Myochamidae . 



B. Adelosiphonia 



8. Pandoridae 



9. Lyonsiidae 



10. Lyonsiellidae . 

 Superfamily 2. Ensiphonacea 



11. Clavagcllidae . 



12. Euciroidae 

 Superfamily 3. Poromyacea 



13. Poromyacidae 



14. Cuspidariidae 



