Volume 23 Number 12 (never issued)
Volume 23 Number 11 (April 15, 1910)
- W. H. DALL. New species of West American shells: 133–136
- P. BARTSCH. New marine shells from the Northwest Coast of America: 136–138
- A. E. ORTMANN. The systematic position of the unionid-genus Parreysia: 139–142
- V. STERKI. New species of Sphaeriidae: 142–143
- Publications received: 143–144
Volume 23 Number 10 (March 8, 1910)
- T. H. ALDRICH. A new fossil Mitra from West Florida, and a new Eocene Astarte: 121–122
- H. A. PILSBRY. Notes on the classification of the Tornatellinidae: 122–124
- Y. HIRASE. A conchological museum for Japan: 124–125
- F. C. BAKER. A new variety of Lymnaea stagnalis (concluded): 125–126
- H. A. PILSBRY. John Ford: 126–129
- Publications received: 129–132
- Notes: 132
Volume 23 Number 9 (February 17, 1910)
- J. H. FERRISS. A collecting excursion north of the Grand Canyon of the Colorado: 109–112
- F. C. BAKER. A new variety of Lymnaea stagnalis: 112–113
- L. S. FRIERSON. Description of a new species of Anodonta: 113–114
- A. E. ORTMANN. A new system of the Unionidae: 114–120
- Notes and news: 120
Volume 23 Number 8 (January 17, 1910)
- H. A. PILSBRY. New Amnicolidae of the Panuco River System, Mexico: 97–100
- F. N. BALCH. Rectification of the nomenclature of the Nudibranchiata in Lermond’s “Shells of Maine”: 100–102
- E. G. VANATTA. Unionidae from southeastern Arkansas and N. E. Louisiana: 102–104
- H. HANNIBAL. Valvatidae of the Western North America: 104–107
- T. D. A. COCKERELL. An apparently new slug from the River Nile: 108
- Notes: 108
Volume 23 Number 7 (December 9, 1909)
- H. A. PILSBRY. On some deformed Cypraea tigris from the collection of A. Da Costa Gomez: 85–86
- H. W. WINKLEY. Essex County notes: 86–89
- H. A. PILSBRY. New Helicina and Strobilops from Florida: 89–91
- F. C. BAKER. Mollusks from Kansas and Oklahoma: 91–94
- G. D. HANNA. The Mollusca of Douglas County, Kansas. Gasteropoda (concluded): 94–96
Volume 23 Number 6 (November 13, 1909)
- S. S. BERRY. The known Mollusca of San Bernardino County, California: 73–79
- F. C. BAKER. Range of Lymnaea umbilicata: 80
- G. D. HANNA. The Mollusca of Douglas County, Kansas. Gasteropoda: 81–82
- Notes: 83–84
Volume 23 Number 5 (October 2, 1909)
- K. J. BUSH. A new Bela from Frenchman’s Bay, Maine: 61–62
- D. BLANEY. List of shells from Frenchman’s Bay, Maine: 62–63
- H. A. PILSBRY and E. G. VANATTA. A new land shell from Bermuda: 63–64
- E. G. VANATTA. A new Rissoa from Bermuda: 65
- V. STERKI. Descriptions of two new species of Musculium: 66–67
- H. W. WINKLEY. On collecting: 68–69
- M. SMITH. The land Mollusca of Aldabra: 69–70
- W. H. DALL. Dr. R.E.C. Stearns: 70–72
- Anonymous. Ludwig Rudolph Sophus Bergh: 72
Volume 23 Number 4 (September 4, 1909)
- H. A. PILSBRY. Mollusks from northeastern Mexico: 45–49
- C. DE LA TORRE. Descriptions of two new Cuban land shells: 49–50
- J. B. HENDERSON, JR. Descriptions of new Cuban land shells: 50–51
- V. STERKI. Bifidaria armifera Say, and its varieties: 52–54
- P. BARTSCH. More notes on the family Pyramidellidae: 54–59
- Notes: 60
- Publications received: 60
Volume 23 Number 3 (July 9, 1909)
- F. N. BALCH. A spring collecting trip. Notes on New England nudibranchs II: 33–38
- H. W. WINKLEY. New England Pyramidellidae, with description of a new species: 39–40
- H. HANNIBAL. A new Carinifex from the Santa Clara Lake Beds (Pliocene), California: 40–41
- F. C. BAKER. Note on Planorbis binneyi Tryon: 41–42
- V. STERKI. Pisidium marci, n. sp.: 42–43
- Notes: 43–44
Volume 23 Number 2 (June 4, 1909)
- V. STERKI. Some observations and notes on Musculium: 17–19
- F. C. BAKER. Description of a new fossil Lymnaea: 19–21
- B. WALKER. Notes on Planorbis II: P. bicarinatus (concluded): 21–32
- Notes: 32
Volume 23 Number 1 (May 17, 1909)
- B. WALKER. Notes on Planorbis II: P. bicarinatus: 1–10
- E. W. HUMPHREYS. Recent fresh-water fossils from Bronx Borough, New York City: 10–11
- A. E. ORTMANN. Unionidae from an Indian garbage heap: 11–15
- H. W. WINKLEY. Variation: 15–16
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