PLATE VIII. 



Fig. 1. Area (Cunearea) chemnitzioides n. sp. From a gutta-percha impression, showing 



Page 



cardinal area. Striations exaggerated by erosion. Brighton. Oligocene 44 



2. Area (Argina) billingsiana n. sp. Length 31 mm. Brighton, Trinidad. Upper 



Oligocene 45 



3. Area (Argina) billingsiana n. sp. Interior of same shell 45 



4. Area (Argina) brightonensis n. sp. Length 24 mm. Brighton. Oligocene 46 



5. Area (Argina) brightonensis n. sp. Same shell, lateral view 46 



6. Area (Argina) brightonensis n. sp. Interior of same shell showing hinge characters. . . 46 



7. Area (Argina) pariaensis n. sp. Length 24 mm. Gulf of Paria between La Brea and 



San Fernando. Recent 47 



8. Area (Argina) pariaensis n. sp. Interior of same shell showing hinge characters 47 



9. Area (Argina) pariaensis n. sp. Lateral view of same shell 47 



10. Area (Noetia) sheldoniana n. sp. Length 15 mm. Brighton, Trinidad. Upper 



Oligocene 43 



11. Area (Noetia) sheldoniana n. sp. Interior of same valve 43 



12. Cucullcea harttii Rathbun. Length 29 mm. Soldado Rock, Gulf of Paria. Midway 



Eocene 48 



13. Ghjcymeris (Axinea) viamedice n. sp. Height 16 mm. Soldado Rock. Midway 



Eocene 49 



14. Venerieardia erucedemaionis n. sp. Length approximately 7 mm. Soldado Rock. 



Lignitic Eocene ^1 



15. Venerieardia planicosta Lamarck. Width 55 mm. Soldado Rock. Midway Eocene. . 51 



16. Venerieardia planicosta Lam. Interior mould with fragmentary margin of exterior. 



Width 48 mm. Soldado Rock. Midway Eocene 51 



17. Venerieardia thalassoplekta n. sp. Height 19 mm. Soldado Rock. Midway Eocene. 53 



18. Unto sp. indet. Interior mould. Showing alternating teeth. Length of fragment 70 



mm. Between La Brea and San Fernando, Trinidad. Probably Oligocene - ■ 50 



19. Unto sp. indet. Same species as above. Another mould showing general form, medial 



sulcus, and anterior muscular scar 



