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January 3, 1871
Volume 23, Page 9
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January 31
Volume 23, Page 11
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Notes on the natural history of Fort Macon, N.C., and vicinity. (No.1)
Volume 1871, Page 12
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February 28
Volume 23, Page 51
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[Fishes from the Amazon above the mouth of the Rio Negro]
Volume 23, Page 55
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Dalmanites Ohioensis, Meek
Volume 23, Page 91
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April 4, 1871
Volume 23, Page 101
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April 11
Volume 23, Page 102
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[Some anatomical points of importance in the classification of the siluroids of the Amazon]
Volume 23, Page 112
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May 23
Volume 23, Page 117
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Contribution to Orthopterology
Volume 23, Page 149
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June 13
Volume 23, Page 157
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June 27
Volume 23, Page 158
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Notice of a New Beachiopod from the Lead-Bearing Rocks at Mine La Motte, Missouri
Volume 23, Page 185
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July 11
Volume 23, Page 198
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Ninth contribution to the herpetology of tropical America
Volume 23, Page 200
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August 8
Volume 23, Page 228
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Descriptions of New Species of Birds of the Families Troglodytidæ and Tyrannidæ
Volume 23, Page 233
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On the fishes of the Ambyiacu River
Volume 23, Page 250
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November 28
Volume 23, Page 297
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Notes on Feldspars and Some Other Minerals of Philadelphia and Vicinity
Volume 23, Page 299
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December 12
Volume 23, Page 305
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Descriptions of New Western Palæozoic Fossils, Mainly from the Cincinnati Group of the Lower Silurian Series of Ohio
Volume 23, Page 308
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The Librarian's Report
Volume 23, Page 337
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Recording Secretary's Report
Volume 23, Page 341
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Reports of the Conchological Section
Volume 23, Page 343
