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1 Department of Biology, Inter American University of Puerto Rico, San German, P. R. 00753
Two hundred and eighty-two sea urchins, Diadema antillarum, Echinometra lucunter, Lytechinus variegatus, and Tripneustes ventricosus, collected from the littoral in the Caribbean were examined for intestinal ciliates. The specimens were collected from the islands, St. Thomas, St. Croix, Curacao, Vieques, and with major emphasis, the southwestern coast of Puerto Rico. Studies were made primarily on living ciliates with the exception of a few specimens fixed in Schaudinn's fluid and stained with iron hematoxyin; seven ciliates were found: Anophrys aglycus, Anophrys elongata, Biggaria bermudensis, Biggaria echinometris, Cohnilembus caeci, Cyclidium rhabdotectum, and Metopus circumlabens.
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