The Tertiary Microzoic Formations of Trinidad, West Indies

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Abstract
General Conclusions: The Eocene molluscan faunas of Trinidad show no near alliances with any other known faunas. In this they differ from the well-known and easily recognized Miocene fauna found in Haiti, Jamaica, Cuba, Cumana, Trinidad (Caroni Series), and other localities. Nevertheless a few of the forms have been found elsewhere. The Echinolampas ovumserpentis, Terebratula carneoides , and Ranina porifera of the Naparima Beds recur in the Eocene of St. Bartholomew's (north-eastern West Indies), and I have already noted that the same beds have a Nucula and a Leda in common with Barbados. It is only with doubt that the name of Natica phasianelloides , a Miocene fossil of Cuba and Jamaica, can be assigned, to the imperfect casts found near San Fernando in Trinidad. Of these casts some are fully 6 inches long. Some Pinna -like shells, also in the state of casts, found in these beds are still larger than this. Erycina tensa , a near ally of E. obliqua , Caillat, of the Paris Eocene, was described by me from the Manzanilla Beds in Trinidad. Gabb included the name in his list of the Miocene fossils of Haiti. When dealing with the fossils of that island I passed over this observation, but I have since seen reason to believes, that Gabb's shell was not Erycina tensa , but the flatter valve of a species of Corbula . These corrections leave us with a single molluscan species ( Corbula vieta ) in common between the Eocene and the Miocene of the West Indies. The foraminifera of the shallow-water

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