Contents of Volume 64 (1950–1951)

• H. A. PILSBRY and A. A. OLSSON. A new Caribbean mollusk: 109–110
• R. T. ABBOTT. New deep-water Olivellas from Florida, with notes on the O. jaspidea-nivea complex: 110–116
• J. S. SCHWENGEL. New marine mollusks from British West Indies and Florida Keys: 116–119
• H. A. PILSBRY. New species of Amnicola and Streptostyla: 119–120
• W. G. FARGO. A new Vexillum from Pliocene of St. Petersburg, Florida: 121–122
• E. P. CHACE. A new subspecies of Ammonitella: 122
• C. B. WURTZ. Catalogue of Ancylidae of South and Central America and the West Indies, with description of a new species: 123–131
• M. P. WEINGARTNER. European ballast shells in Staten Island, N. Y.: 132
• F. HAAS. Notes on some streptaxids: 133–134
• H. VAN DER SCHALIE. Arnold Edward Ortmann as revealed by his letters: 134–141
• J. T. WOOD. Helicella caperata (Montagu) in Yorktown, Virginia: 141–142
• Notes and news: 142–144
• Publications received: 144

• B. B. BAKER. Interesting shells from the Delmarva Peninsula: 73–77
• R. I. JOHNSON. A clarification of some Central American Unionidae described by R. A. Philippi: 77–83
• A. D. HOWARD. The family Juliidae: 84–87
• H. A. PILSBRY and E. P. CHEATUM. Land snails from the Guadalupe Range, Texas: 87–90
• L. HUBRICHT. The preservation of slugs: 90–91
• J. L. BAILY, JR. Some notes on Haliotis: 91–94
• G. K. MACMILLAN. A new subspecies of Succinea from Japan: 94–96
• H. W. HARRY. Additional notes on the foreign snails of Louisiana: 96–99
• R. A. HEILMAN. The mollusks of Dauphin County, Pennsylvania: 100–101
• Notes and news: 101–105
• lPublications received: 105–108

• H. A. PILSBRY. New fountain snails from Florida: 37–39
• D. J. ZINN. Tethys (Aplysia) willcoxi Heilprin in Narragansett Bay and other Rhode Island waters: 40–47
• R. STOHLER. Studies on mollusk populations: I: 47–51
• R. J. DRAKE. Holospira kriegeri, new species, from Tamaulipas: 51–53
• C. J. BUSHEY. Land snails from Clifty Falls State Park, Jefferson County, and from Versailles State Park, Ripley County, Indiana: 54–55
• H. A. PILSBRY. Pseudosubulina, a genus new to the United States: 55–56
• H. A. PILSBRY. Notes on land snails of Texas: 56–58
• C. B. LEE. Some new records for exotic slugs in the United States: 58–59
• M. SMITH. New Mexican and Panamic shells: 60–61
• W. G. FARGO. Daniel Littlefield Emery: 61–62
• P. E. RAYMOND. Olof O. Nylander, 1864–1943: 63–64
• M. C. TESKEY. The American Malacological Union, Sixteenth Annual Meeting: 65–67
• Notes and news: 67–70
• Publications received: 71–72

• A. R. CAHN. Conchological monuments in Japan: 1–4
• F. HAAS. Some land and fresh-water mollusks from Pará State, Brazil: 4–6
• L. HUBRICHT. The Polygyridae of Pittsylvania County, Virginia: 6–9
• J. L. BAILY, JR. Maxwellia, genus novum of Muricidae: 9–14
• M. R. CARRIKER. Killing and preservation of bivalve larvae in fluids: 14–17
• H. B. BAKER. Chondropoma schaliei: 17–19
• R. W. DEXTER. Distribution of the mollusks in a basic bog lake and its margins: 19–26
• H. B. BAKER. The type of a species: 27–28
• H. DODGE. Hiatella Daudin versus Saxicava Bellevue (continued): 29–33
• E. S. MARKS. New subgenera of Busycon Roeding: 34
• Notes and news: 35–36