Volume 39 Number 4 (April 9, 1926)
- W. P. WOODRING. Pliocene Viviparus-like opercula from California: 109–111
- N. M. GRIER. Notes on the naiades of the Upper Mississippi Drainage: III. On the relation of temperature to the rhythmical contractions of the "mantle flaps" in Lampsilis ventricosa (Barnes): 111–114
- T. IREDALE. The last word on Ancylastrum: 114–115
- H. VON IHERING. On Mycetopoda falcata Higgins: 116
- F. C. BAKER. New forms of Planorbis and Lymnaea with notes on other forms: 116–121
- A. MOZLEY. Molluscs from the Manitoba-Ontario boundary: 121–128
- C. W. JOHNSON. A list of the mollusks collected by Mr. Owen Bryant along the coasts of Labrador, Newfoundland and Nova Scotia: 128–135
- C. W. JOHNSON. Edward Sylvester Morse: 135–137
- B. SMITH. William Martin Beauchamp, 1830–1925: 138–140
- T. IREDALE. W. Lewis May: 140–141
- C. W. JOHNSON. Spirula spirula (Linne): 141–142
- Publications received: 142–143
- Notes and news: 143–144
Volume 39 Number 3 (January 11, 1926)
- A. E. ORTMANN. Helix nemoralis L. in Lynchburg, Va.: 73–74
- W. H. DALL. On Amicula and Cryptochiton: 75–77
- T. D. A. COCKERELL. Borus Lorentzianus Doering: 77–78
- H. A. PILSBRY. Brazilian mollusks collected by Dr. Jos. Bequaert: 78–80
- E. G. VANATTA. Land snails of Breathitt County, Kentucky: 80
- N. E. WEISBORD. Notes on marine mollusks from the Yucatan Peninsula, Mexico: 81–87
- A. E. ORTMANN. Unionidae from the Reelfoot Lake Region in West Tennessee: 87–94
- F. M. MACFARLAND. The Acanthodorididae of the California Coast: 94–103
- Notes and news: 103–105
- Publications received: 106–108
Volume 39 Number 2 (October 31, 1925)
- C. W. JOHNSON. The exhibition of Mollusca in a museum: 37–40
- H. B. BAKER. Isolation and Curacao [sic]: 40–44
- H. B. BAKER. The type of Ancylastrum Bourguignat: 44–47
- T. IREDALE. The status of Amicula: 47–49
- F. M. MACFARLAND. The Acanthodorididae of the California Coast: 49–66
- E. W. BERRY. Protoconchs of Caecum in the Miocene of Maryland: 66–67
- Anonymous. Yoichiro Hirase: 67–68
- T. IREDALE. W. H. Hargraves: 68–69
- T. IREDALE. R. Murdoch: 69–70
- Notes and news: 70–72
- Publications received: 72
Volume 39 Number 1 (July 8, 1925)
- J. BEQUAERT. Malacological notes from the Amazon River, Brazil: 1–5
- B. WALKER. New species of fresh-water operculates: 5–8
- A. M. STRONG. Notes on West Coast Calyptraea: 9–11
- W. J. CLENCH. A short list of land and freshwater mollusks from southeastern Texas: 11–12
- H. B. BAKER. Nomenclature of Veronicellidae (Vaginulidae) 13–18
- G. D. HANNA. Zalophancylus, a fish vertebra, not a mollusk: 18–19
- T. D. A. COCKERELL. Partula in Guam: 19–21
- T. D. A. COCKERELL. Reversed Lymnaea peregra: 21–24
- J. H. FERRISS. A new Texas Bulimulus: 24–25
- W. H. DALL. A new Acteocina from British Columbia: 25–26
- H. N. LOWE. Shell notes from Italy: 26–27
- Notes and news: 27–31
- Publications received: 31–36
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