Volume 33 Number 4 (April 20, 1920)- J. H. FERRISS. The Navajo Nation: 109–111
- A. JACOT. On the marine Mollusca of Staten Island, N. Y.: 111–115
- G. H. CLAPP. Vitrea (Paravitrea) multidentata and lamellidens: 115–118
- J. HENDERSON. The nomenclature and systematic positions of some North American fossils and recent mollusks. II: 118–122
- F. C. BAKER. A new Planorbis from Illinois: 123–125
- F. C. BAKER. A new form of Amnicola from the Ohio Pleistocene deposits with notes on a Physa from the same formation: 125–127
- L. G. FRIERSON. Lasmigona viridis, Rafinesque, 1820: 127–130
- S. S. BERRY. Turritidae vs. Turridae: 130–133
- J. R. LE B. TOMLIN. On certain of Link’s names in the Mitridae: 133–134
- I. S. OLDROYD. New species of West Coast shells: 135–136
- G. H. CLAPP. Herbert Huntington Smith: 136–141
- Notes: 141–142
- Publications received: 142–144
Volume 33 Number 3 (January 22, 1920)
- C. GOODRICH. Goniobases of Ohio: 73–74
- C. W. JOHNSON. Some large specimens of Argonauta: 74–76
- H. A. PILSBRY. Some Auriculidae and Planorbidae from Panama: 76–79
- A. A. HINKLEY. Guatemalan notes: 79–80
- V. STERKI. Some notes on Philomycus: 80–83
- W. F. CLAPP. The shell of Philomycus carolinianus (Bosc.): 83–89
- J. J. GOUVEIA. Climatic conditions as indicated by land shells on the island of Oahu: 89–92
- J. M. OSTERGAARD. A new Cypraea from Hawaii: 92–93
- H. A. PILSBRY. Review of the Thysanophora plagioptycha group: 93–96
- E. G. VANATTA. Land shells of Maine: 96-99
- B. WALKER. Ancylus obscurus Haldeman and species referred to it: 99–103
- W. H. DALL. A new species of Mitra from California: 103
- J. HENDERSON. Changes in western molluscan faunas: 103–105
- Notes: 105–106
- Publications received: 106–108
Volume 33 Number 2 (November 6, 1919)
- J. H. FERRISS. Along the Mexican border, 1919: 37–44
- C. W. JOHNSON. Notes on the species of Fasciolaria of the Southeastern United States: 44–48
- S. S. BERRY. Three new alpine vertigos from California: 48–52
- H. A. PILSBRY. A new Californian Micrarionta: 53
- H. A. PILSBRY. A new Chinese Clausilia: 53–54
- J. J. GOUVEIA: A collecting trip on the island of Oahu, Hawaiian Islands, by the Gulick Natural History Club: 54–58
- H. C. HIGGINS. A new variety of Oliva sericea miniacea: 58–59
- F. TABLEMAN. Collecting in the vicinity of Newark, New Jersey: 59–61
- C. R. ORCUTT. Shells of La Jolla, California: 62–67
- E. G. VANATTA. Land shells of Laurel Springs, New Jersey: 67–68
- Publications received: 68–70
- Notes: 70–72
Volume 33 Number 1 (July 16, 1919)
- C. W. JOHNSON. An old collecting ground revisited: 1–8
- G. H. CLAPP. New land shells from Alabama and Tennessee: 8–10
- W. H. DALL. A new form of Ampullaria: 10–11
- F. C. BAKER. A new species of Physa from New York State: 11–13
- A. A. HINKLEY. Mollusca found in the vicinity of Dubois, Illinois: 14–17
- E. G. VANATTA. Land shells of southern Florida: 18
- H. A. PILSBRY and J. H. FERRISS. New land snails collected by the Ferriss and Hinkley Expedition of 1919: 19–21
- G. WILLETT. Mollusca of Forrester Island, Alaska. Univalves (continued): 21–28
- W. F. CLAPP. A new Camaena from the Philippine Islands: 28–30
- Notes: 31–32
- Publications received: 32–36
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