Volume 34 Number 4 (May 5, 1921)
- H. A. PILSBRY and C. M. COOKE. A new Achatinella from Oahu: 109–110
- W. H. MEINECKE. Hunting Achatinella meineckei and Partulina dubia in the Waianae Mountains, Oahu: 110–113
- T. D. A. COCKERELL. Notes on Craspedopoma lucidum, Lowe and other Madeira snails: 113–114
- T. S. OLDROYD. New Pleistocene mollusks from California: 114–116
- T. S. OLDROYD. Some varieties of western olivellas: 117–119
- O. O. NYLANDER. Collecting shells on the East Coast of Florida in the winters 1891 and 1892: 119–124
- W. H. DALL. Molluscan species names in the Portland Catalogue, 1786, Part II, foreign species (continued): 124–132
- W. H. DALL. Two new South American shells: 132–133
- T. D. A. COCKERELL. The genus Plebecula Lowe: 133–136
- C. W. COOKE. New names for West Indian tertiary pectens: 137
- H. C. FULTON. George Brettingham Sowerby: 137–138
- Notes: 138–141
- Publications received: 142–144
Volume 34 Number 3 (January 11, 1921)
- B. WALKER. Ancylus obscurus Haldeman and species referred to it: 73–76
- W. H. DALL. Two new Pliocene pectens from Nome, Alaska: 76–77
- O. O. NYLANDER. The type localities of Lymnaea emarginata Say and L. ampla Mighels: 77–80
- N. M. GRIER. Notes on the naiad fauna of the Upper Mississippi River: 80–81
- A. E. ORTMANN. The anatomy of certain mussels from the Upper Tennessee: 81–91
- G. D. HANNA. Modiolus demissus Dillwin, in San Francisco Bay: 91–92
- I. S. OLDROYD. A new Peruvian Chione: 93
- E. G. VANATTA. Land shells of southern Florida: 93–95
- J. SHEPARD. The leaping razor shell: 95–97
- W. H. DALL. Species named in the Portland Catalogue: I, American: 97–100
- L. D. THOMPSON. Collecting at Nahant Beach, Mass.: 100–101
- H. A. PILSBRY. William Wilder: 101
- T. D. A. COCKERELL. The land mollusks of the Belgian Congo: 102–104
- Publications received: 104–107
- Notes: 107-108
Volume 34 Number 2 (November 6, 1920)
- A. A. HINKLEY. Guatemala Mollusca: 37–55
- B. WALKER. Anson A. Hinkley: 55–57
- S. S. BERRY. Turritidae vs. Turridae: 57–58
- E. S. MORSE. On the occurrence of Pyramidula rupestris in Maine: 58–59
- A. JACOT. Notes on marine Mollusca about New York City: 59–60
- F. C. BAKER. Animal life in loess deposits near Alton, Illinois, with descriptions of two new varieties of land shells from the same deposits: 61–66
- S. S. BERRY. Note on a preoccupied generic name in cephalopods: 66–67
- F. C. BAKER. Notes on a small collection of shells from Alaska: 67–69
- Notes: 69–70
- Publications received: 70–72
Volume 34 Number 1 (July 19, 1920)
- J. H. FERRISS. The Navajo nation: 1–14
- N. M. GRIER. On the erosion and thickness of shells of the fresh-water mussels: 15–22
- W. H. DALL. A new Alaskan chiton: 22–23
- G. H. CLAPP. A new species of Pyramidula from Alabama and notes on P. cumberlandiana with new varieties: 23–26
- Anonymous. Achatinella hunting in Northwestern Oahu: 26–27
- W. H. DALL. Turritidae vs. Turridae: 27–28
- E. G. VANATTA. Land shells from Beaver County, Pennsylvania: 28
- Notes: 29–31
- Publications received: 31–36
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