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January 31
Volume 51, Page 4
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New and Interesting Species in the "Isaac Lea Collection of Eocene Mollusca"
Volume 51, Page 71
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Some Observations on the Illecellewaet and Asulkan Glaciers of British Columbia
Volume 51, Page 121
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Descriptions of New Species of Turbonilla of the Western Atlantic Fauna, with Notes on Those Previously Known
Volume 51, Page 145
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March 28
Volume 51, Page 178
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Notes on a small collection of Chinese fishes
Volume 51, Page 179
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A small collection of batrachians and reptiles from eastern Mongolia
Volume 1899, Page 183
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New and Little-Known Species of Pristiloma
Volume 51, Page 185
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Contributions to a Knowledge of the Hymenoptera of Brazil, No. 6: A Collection from Rio Grande do Sul and São Paulo
Volume 51, Page 195
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Some untenable names in ornithology
Volume 51, Page 201
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Thermotropic Movement of the Leaves of Rhododendron maximum L
Volume 51, Page 219
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Relations of the Land Molluscan Fauna of South America
Volume 51, Page 226
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Neuropterous Insects Collected by Dr. A. Donaldson Smith in Northeastern Africa
Volume 51, Page 228
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West American Eulimidæ
Volume 51, Page 254
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A New Australian Eulima
Volume 51, Page 258
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Some notes on Coccidae
Volume 1899, Page 259
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Descriptions of Two New Gray Foxes
Volume 51, Page 276
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The Marine Fishes of Peru
Volume 51, Page 324
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Monazite in Delaware County, Pa
Volume 51, Page 377
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Confirmation of the Generic Characters of Ashmunella
Volume 51, Page 379
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New Species and Varieties of Mollusks from Miami, Florida
Volume 51, Page 403
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Contributions to a Knowledge of the Hymenoptera of Brazil, No. 7: Eumenidæ (Genera Zethus, Labus, Zethoides, Eumenes, Montezumia and Nortonia)
Volume 51, Page 407
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October 10
Volume 51, Page 465
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A new species of Thersites
Volume 1899, Page 473
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A New Race of Short-Eared Owl
Volume 51, Page 478
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Observations on Fishes from the Caroline Islands
Volume 51, Page 482
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Presentation of a Portrait of Carolus Linnœus by Mr. Charles E. Smith
Volume 51, Page 498
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A New American Species of Zonitoides
Volume 51, Page 524
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Report of the Curators
Volume 51, Page 538
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Report of the Biological and Microscopical Section
Volume 51, Page 541
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Report of the Ornithological Section
Volume 51, Page 548
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Council for 1900
Volume 51, Page 550
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Elections during 1899
Volume 51, Page 551
