PROC. BIOL. SOC. WASH. 91(2), 1978, pp. 539-545 STATUS OF THE GENUS OCEANIDA DEFOLIN (GASTROPODA: EULIMIDAE), WITH A DESCRIPTION OF A NEW SPECIES William G. Lyons Abstract. — Monotypic genera Spiroclimax Morch, 1875, and Athleenia Bartsch, 1946, are later synonyms of Oceanida DeFolin, 1871; type-species of both genera are identical to O. graduata, the type-species of Oceanida. All were described from the tropical western Atlantic. Oceandia inglei n. sp. from Florida and North Carolina differs from O. gr adnata by lacking tabulate shoulders at posterior angles of spiral whorls. Differences be-tween Eulimidae (preferred to Melanellidae) and Stiliferidae are unclear, indicating the latter should be combined with the former family. Three originally monotypic genera have been erected to contain the single species most recently known as Athleenia burriji Bartsch, 1946. The earliest available name for the genus appears to be Oceanida DeFolin, 1871. Another species, presently known from Florida and North Carolina, is previously unnamed and is described herein. Specimens were examined from collections of the Hourglass Cruises off west Florida, in samples taken during faunal studies near the Florida Power and Light nuclear facility at Hutchinson Island, Florida east coast, and in other programs conducted by the Florida Department of Natural Re-sources (FDNR) Marine Research Laboratory. Most specimens are housed in the FDNR invertebrate reference collection (catalogue prefix FSBC I) at St. Petersburg. Other specimens were examined from collections of the National Museum of Natural History (USNM), Washington, D.C., the Steger collection, now in the Delaware Museum of Natural History (DMNH), Greenville, Delaware, and additional material collected at Hutchinson Island by Applied Biology, Inc., Jensen Beach, Florida. Speci-mens were deposited in molluscan collections at the British Museum (Nat-ural History) (BMNH), London, and the Museum of Comparative Zoology (MCZ), Harvard University, Cambridge, Massachusetts. Genus Oceanida DeFolin, 1871 Oceanida DeFolin, 1871:264 (type-species Oceanida graduata DeFolin, 1871, by monotypy).— Kisch, 1959:107. Spiroclimax Morch, 1875:168 (type-species Spiroclimax scalaris Morch, 1875, by monotypy). Chrysallida (Oceanida): Thiele, 1929:232. Odostomia (Spiroclimax): Thiele, 1929:235.