Type specimens of recent and fossil Testudines and Crocodylia in the collections of the Netherlands Centre for Biodiversity Naturalis, Leiden, the Netherlands

We report a total of 57 type specimens (31 primary and 26 secondary) belonging to 27 nominal species of chelonians (23) and crocodilians (4) in the collection of the Netherlands Centre for Biodiversity Naturalis Leiden, the Netherlands. Fragments of fossil crocodilians have not been included in the specimen count. We provide the original name and publication, type locality, synonyms under which type specimens have been cited in the literature, current name, comments on the type material, its history, and its status and provide information on illustrations.