Sixty-seven species and four subspecies of ostracodes are described or listed from the middle Tertiary Isabela-San Sebastian section in northwestern Puerto Rico. Twelve species and two subspecies are new. The ostracodes suggest correlation of the San Sebastian Formation with the combined Vicksburg Group and Chickasawhay Formation in the Gulf Coast Oligocene, of the Lares Formation with the Paynes Hammock and Anahuac Formations of the Lower Miocene, and of the Cibao Formation with the Chipola Formation of Florida.

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