to Zoology, number 189, 41 pages, 24 figures, 3 tables, 1975.-Eighty-nine marine mollusks of Ascension are identified and short synonymies, distributional information, and remarks concerning their morphology, relationships, and zoogeography are given. Comparisons are made between the molluscan faunas of St. Helena and Ascension, overall findings showing that species of both islands are derived in similar proportions from the various other world faunal areas. Species endemicity is many times greater on St. Helena than on Ascension, probably due in part to the considerably greater geological age of the former island. OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. SI PRESS NUMBER 5199. SERIES COVER DESIGN: The coral Montastrea cavernosa (Linnaeus). Library of Congress Cataloging in Publication Data Rosewater, Joseph, 1928-An annotated list of the marine mollusks of Ascension Island, South Atlantic Ocean. (Smithsonian contributions to zoology, no. 189) Supt. of Docs, no.: SI 1.27:189 1. Mollusks-Ascension Island (Atlantic Ocean). 2. Mollusks-South Atlantic Ocean. I. Title. II. Title: Marine mollusks of Ascension Island. III. Series: Smithsonian Institution. Smithsonian contributions to zoology, no. 189. QL1.S54 no. 189 [QL424.5.A8] 591'.08s [594'.09'24] 74-16371 For sale by the Superintendent of Documents,