PLATE \XX\l\. 



Fig. I. Area hypainela Dall ; Oligocene of Chipola, Florida ; 50 mm. ; p. 637. 



Kiy. 2. Area arcs/a Dall ; Miocene of Alum Bluff, Florida ; 41 mm. ; p. 655. 



Fig. 3. Area pkalarea Dall ; Oligocene of Oak Grove, Florida ; 23 mm. ; p. 626. 



Fig. 4. Area areitla Heilprin ; Oligocene of Tampa silex beds ; 47 mm. ; p. 624. 



Fig. 5. Area irregularis Dall ; Pliocene of the Caloosahatchie marls ; 52 mm. , 



p. 623. 



Fig. 6. Area triphera Dall ; Caloosahatchie Pliocene; 1 8 mm. ; p. 648. 

 Fig. 7. Area tolcpia Dall ; Oligocene of Bowden, Jamaica ; dorsal view ; 28 mm. ; 



p. 649. 



Fig. 8. The same, side view ; p. 649. 



Fig. 9. Area (Itathyarea) llcnilersvni Dall ; Oligocene of Howden ; 2 mm. ; p. 653. 

 Fig. 10. Ervilia eliipolana Dall ; Oligocene of the Chipola beds; 4.2 mm. ; p. 914. 

 Fig. n. Area earolinensis Wagner; Miocene of North Carolina ; 56 mm. ; p. 639. 

 Fig. 12. Area frixwdeniatM Dall ; Oligocene of Bowden, Jamaica ; II mm. ; p. 622. 

 Fig. 13. Area donacia Dall ; Oligocene of Bowden, Jamaica; 6.5 mm. ; p. 649. 

 Fig. 14. Area paratina Dall ; Chipola marl; 28 mm. ; p. 621. 



Fig. 15. Area aeainpsa Dall; Oligocene of Alum Bluff, Florida ; 20 mm. ; p. 648. 

 Fig. 16. Emilia vreifoneiisis Dall; Nehalem River, Oregon; 7.6 mm. ; p. 916. 

 Fig. 17. Emilia polita Dall; Caloosahatchie Pliocene; 6.3 mm. ; p. 916. 

 Fig. 1 8. Alicna piislnlnsa Dall; Oligocene of Oak drove, Florida; 6.5 mm. 

 Fig. 19. Eniilia, triangularis Dall ; Oligocene of the Chipola beds ; 5.7 mm. ; p. 915. 

 Fig. 20. Ervilia fata Dall ; Miocene of Duplin County, North Carolina ; 5 mm. ; 



p. 915. 

 Fig. 21. Carolia jainaiccnsis Dall ; Eocene of Cambridge beds, Jamaica ; 48 mm. 



broad ; p. 776. 

 Fig. 22. Aligcna pustulasa Dall; Oligocene of Oak drove, Florida; view of interior; 



6.5 mm. 

 Fig. 23. Mactra (Mactrotoma) cymata Dall; Oligocene of Oak drove, Florida ; 31 mm. ; 



p. 893. 



Fig. 24. Area haliiionata Dall ; Oligocene of Bowden, Jamaica ; 56 mm. ; p. 646. 

 Fig. 25. Area clisia Dall ; Miocene of Virginia; 56 mm. ; p. 657. 

 Fig. 26. Area actinophora Dall ; Oligocene of Monkey Hill, Panama Railway ; 46 mm. ; 



p. 647. 



928 



