PLATE LVI. 



Fig. i. Cardita (Carditamera) catharia Dall ; Caloosahatchie Pliocene of Florida; Ion. 



7.5 mm.; p. 1416. 

 Fig. 2. V enericardia (Pleuromeris) tellia Dall; Chipola Oligocene; Ion. 3.5 mm.; 



P- 1432. 

 Fig. 3. Cardita (Carditamera) Guppyi Dall; Pliocene of Trinidad, West Indies; Ion. 



4.0 mm. ; p. 1413. 

 Fig. 4. V enericardia (Pteromeris) acaris Dall; Oligocene marl of Bowden, Jamaica; 



Ion. 2.5 mm. ; p. 1434. 



Fig. 5. Goodallia americana Dall ; Claiborne sands ; Ion. 4.25 mm. ; p. 1496. 

 Fig. 6. V enericardia vicksburgiana Dall; Vicksburgian Oligocene of Martin, Florida; 



Ion. 16.0 mm. ; p. 1428. 

 Fig. 7. V enericardia pracisa Dall; Jacksonian Eocene of Cleveland County, Arkansas; 



Ion. 13.2 mm. ; p. 1427. 

 Fig. 8. The same. 

 Fig. 9. Vene.ricardia carsonensis Dall ; Eocene of Carson's Creek ; Ion. 13.0 mm. ; p. 



1427. 

 Fig. 10. Cardita (Carditamera') Vaughani Dall; Miocene of Jackson Bluff, Florida; 



Ion. 35.0 mm. ; p. 1410. 

 Fig. n. Cardita (Carditamera) Horidana Conrad; recent, figured for comparison; 



Florida; Ion. 32.0 mm.; p. 1415. 



Fig. 12. V enericardia simplex Dall ; Wood's Bluff Eocene ; Ion. 18.0 mm. ; p. 1426. 

 Fig. 13. V enericardia bulla Dall; Midwayan Eocene of Texas; Ion. 22.0 mm.; lat. 33.0 



mm. ; p. 1424. 

 Fig. 14. The same. 

 Fig. 15. V enericardia (Pleuromeris) scitula Dall; Oak Grove sands; Ion. 5.0 mm.; 



P- 1433- 

 Fig. 16. V enericardia (Cyclocardia) calif ornica Dall; Miocene of Guadalupe, California; 



Ion. 24.0 mm. ; p. 1431. 

 Fig. 17. Chama draconis Dall, attached valve; Chipola Oligocene; Ion. 26.0 mm.; p. 



1399- 



Fig. 18. Chama draconis Dall, upper valve ; Ion. 22.0 mm. ; p. 1399. 

 Fig. 19. Chama chipolana Dall, attached valve; Chipola Oligocene; Ion. 27.0 mm.; p. 



1398. 



Fig. 20. The same, upper valve; Ion. 22.0 mm. 



Fig. 21. Area (Acar) millifila Dall; Pliocene of Shell Creek, Florida; Ion. 18.5; diam. 

 10.0 mm. 



Fig. 22. Cyrena (Pseudocyrena) dupliniana Dall; Miocene of Duplin County, North 

 Carolina; Ion. 8.5 mm.; p. 1446. . 



Fig. 23. Poromya jamaicensis Dall; Oligocene of the Bowden, Jamaica, marl; Ion. 5.5 

 mm.; p. 1509. 



Fig. 24. Area (Acar) millifila Dall; Pliocene marl f Shell Creek, Florida; the liga- 

 ment is typical of Acar, the radial threads are minutely granular, especially 

 on the posterior dorsal slope ; the shell is thin and the scars obscure. 



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