Contents of Volume 41 (1927–1928)

• C. W. JOHNSON. A review of the New England limpets: 109–117
• J. HENDERSON. Mollusca in their relation to the geological history of Soap Lake, Washington: 118–120
• W. J. CLENCH. Venus mercenaria var. Notata Say: 120–122
• H. B. BAKER. Planogyra asteriscus (Morse): 122–123
• H. B. BAKER. Thiele’s Brazilian land snails: 124–129
• N. M. TEGLAND. Thyasira disjuncta Gabb not Thyasira bisecta Conrad the Recent West Coast shell: 129–131
• B. WALKER. The date of publication of Unio dombeyana Val.: 131
• F. C. BAKER. Description of new varieties of land and fresh water mollusks from Pleistocene deposits in Illinois: 132–137
• C. W. JOHNSON. Stuart Weller: 137–138
• L. S. FRIERSON. Illustrations of Unionidae: 138–139
• Notes and news: 139–143
• Publications received: 143–144

• J. HENDERSON. A collecting trip to the Northwest: 73–77
• H. N. LOWE. Hunting helices in California: 77–79
• H. A. PILSBRY. Cuban land snails collected by H. N. Lowe: 79–81
• H. A. PILSBRY. Helices from California and Texas and a zonitid from Virginia: 81–83
• O. O. NYLANDER. Nadeau Lake, Fort Fairfield, Aroostook County, Maine: 84–85
• J. HENDERSON. Molluscan provinces in the Western United States: 85–91
• J. HENDERSON. Margaritifera vs. Margaritana: 91
• W. H. OVER. Additional records of South Dakota Mollusca: 92–93
• L. G. HERTLEIN. Pecten (Patinopecten) lohri, new name for Pecten oweni Arnold, a Pliocene species from California: 93–94
• G. C. SPENCE. Note on a "double-mouthed" Holospira cockerelli, Dall: 94
• DR. H. V. IHERING. Two new species of shells from Uruguay: 95–97
• W. A. LINDHOLM. On the designation of genotypes: 97–98
• O. W. RICHARDS. The growth of the mussel Mytilus californianus: 99–102
• Publications received: 102–106
• Notes and news: 106–108

• D. B. LANGFORD. Hunting Eulota (Karaftohelix) fiscina Fulton, in Saghalien: 37–40
• T. D. A. COCKERELL. The Mollusca of Lake Baikal: 40–43
• J. R. L. TOMLIN and M. L. WINSLOW. Conus aurora Lamarck: 43–45
• G. D. HANNA and L. G. HERTLEIN. Notes on Ostrea californica Marcou: 45–47
• C. W. JOHNSON. Further notes on the colony of Helix nemoralis in Massachusetts: 47–49
• F. C. BAKER. A new variety of Helisoma campanulata from Michigan: 49–51
• M. SMITH. Non-marine mollusks of Volusia County, Florida: 51–54
• V. STERKI. A new species of Sphaerium (S. notatum): 55–57
• C. GOODRICH. Some misplaced pleurocerids: 57–62
• H. A. PILSBRY. Note on the genus Ceratodiscus: 62–63
• H. A. PILSBRY. On Pomacea Perry (Ampullariidae): 63–64
• H. A. PILSBRY and T. D. A. COCKERELL. A new Japanese Euhadra: 64–65
• C. W. JOHNSON. Jesse Wedgwood Mighels: 65–69
• W. J. CLENCH. Correspondence: 70
• Notes and news: 70–71
• Publications received: 71–72

• H. A. PILSBRY. William Healey Dall: 1–6
• W. J. CLENCH. A new subspecies of Thais from Louisiana: 6–8
• A. E. WOOD and H. E. WOOD. A quantitative study of the marine mollusks of Cape May County, New Jersey: 8–18
• J. HENDERSON. Some South Dakota Mollusca: 19–20
• H. B. BAKER. The type of Streptostyla Shuttleworth: 21
• H. B. BAKER. Guppy’s groups of Helicinidae: 22–23
• F. C. BAKER. Description of a new species of Lymnaea from British Columbia: 23–24
• H. A. PILSBRY and F. C. BAKER. Description of a new species of Somatogyrus from Wisconsin: 24–27
• T. WILLARD. Boston Malacological Club: 27–30
• Anon. W. H. Dall-Memorial resolution of the Conchological Club of Southern California: 31
• Anon. Georg Ossian Sars: 31–32
• Notes: 32–34
• Publications received: 34–36