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PLATE VIII. 



Page 



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



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



Eocene 4g 



13. Glycymeris {Axinea) viamedice n. sp. Height 16 mm. Soldado Rock. Midway 



Eocene 49 



14. Venericardia crucedemaionis n. sp. Length approximately 7 mm. Soldado Rock. 



Lignitic Eocene 51 



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



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



Width 48 mm. Soldado Rock. Midway Eocene 51 



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



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



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



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



sulcus, and anterior muscular scar 50 





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