RANGE OF THE PELECYPODA 427 
Families. 
arboniferous 
Jambrian. 
ilurian, 
Cretaceous. 

Neocene 
Recent. 
Permian, 
Eocene. 
Trias. 
Jura, 
C 
S 
IV. Isoponra 
Superfamily 7. Pectinacea 
33. Pectinidae — . : em |i | fe |e || | 
34. Spondylidae . : i in ee | 
35. Dimyacidae . : i a |e | | | 
36. Limidae. : : ce | coe || || ee || | | — 
Superfamily 8. Anoimiacea 
oie Anomiidae ° 5 . 7 i EE | 
V. DysopoNTA 

Superfamily 9. Myti/aceu 
38. Modiolopsidae . — 
39. Mytilidae : 2 — ee eee | 
40. Dreissensiidae : | — 
Order 2. Anomalodesmacea | 
Superfamily 1. dA natinacea 
A. EUSIPHONIA 
1. Pleuromyacidae ae [A re 
2. Pholadellidae . thea ES es | Se |e 
3. Pheladomyacidae | ie | SA | 
4. Anatinidae weer ee 
5, Periplomidae . ——— 
6. Thraciidae . ; | 
. Myochamidae. 
B. ADELOSIPHONIA 
8. Pandoridae 
9. Lyonsidae 
10. Lyonsiellidae . . | | ——— — 
11. Chamostreidae F | 
Superfamily 2. ELnsiphonacea | 
12. Clavagellidae . . | 
13. Euciroidae 
14. Verticordiidae | | 
15. Poromyacidae : — | | —__— 
16. Cuspidariidae. | et Leees | aes ae 


