>Hi James, I believe Norrisia norrisi Sowerby is the only living member of the genus. On an old listing of fossil species I have, I see a Norrisia microphalus listed, from the Eocene deposits of the Gosport Formation in Alabama. I know nothing about it. Norrisia has a really neat operculum. It looks like a coil of rope. Regards, Paul M. I see the ball is in my court now. K. V. W. Palmer and D. C. Brann (1965-66) compiled a 2-volume work, "Catalogue of the Paleocene and Eocene Mollusca of the Southern and Eastern United States: (Bulletins of American Paleontology, v. 48, no. 218, 1057 pp., 5 pl.). Marvel of marvels, this work is still available from the Paleontological Research Institution, and they have a Website. It IS a catalog--there are only a few illustrations--but it will tell you the complete synonymy of each species up to 1965 as revised by an expert, where the species may be found in outcrop, and where the type specimens are housed, plus a bibliography. It's one of those works that would probably be published on-line today rather than on paper, yet it is one of the most useful books I have on Alabama paleontology. According to Palmer and Brann, there are three species of Norrisia in the Coastal Plains of the eastern and southern U.S., plus a possible fourth. All are known only from Claiborne Bluff, in the middle Eocene Gosport Sand (formerly called the "Claiborne sands"): Norrisia (Norrisella) micromphala (Cossmann, 1893) Norrisia nautiloides (Aldrich, 1911) Norrisia (Norrisella) nitens (I. Lea, 1833) cf. Norrisia (Norrisella) parva (H. C. Lea, 1841) To fend off the obvious question, H. C. Lea was the son of Isaac Lea; the son wrote an article naming several tiny gastropods from the Gosport Sand at the age of 19 or so, if memory serves. For a taxonomic discussion of these species, see: Palmer, K. V. W., 1937, The Claibornian Scaphopoda, Gastropoda, and dibranchiate Cephalopoda of the southern United States: Bulletins of Ame rican Paleontology, v. 7, no. 32, pt. 1, 548 p.; pt. 2, 90 pl. Long since out of print, but should be available at the library of James' huge local university. Andrew K. Rindsberg Geological Survey of Alabama