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Jan. 7th, 1868
Volume 20, Page 1
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A Monograph of the Alcidæ
Volume 20, Page 2
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Feb. 4th
Volume 20, Page 85
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Descriptions of Some New Species of Diurnal Lepidoptera. Series III
Volume 20, Page 87
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March 10th
Volume 20, Page 91
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An examination of the Reptilia and Batrachia obtained by the Orton Expedition to Equador and the Upper Amazon, with notes on other species
Volume 20, Page 96
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Second supplement on some new Raniformia of the old World
Volume 20, Page 138
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Notes on Some Singular Forms of Chinese Species of Unio
Volume 20, Page 145
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Variations in Epigæa repens
Volume 20, Page 153
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Monœcism in Luzula campestris
Volume 20, Page 156
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June 9th
Volume 20, Page 159
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Descriptions of Seven New Species of Unio from North Carolina
Volume 20, Page 160
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Indication of an Elotherium in California
Volume 20, Page 177
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Notice of Some Vertebrate Remains from the West Indian Islands
Volume 20, Page 178
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Notice of Some Extinct Cetaceans
Volume 20, Page 196
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Notice of American Species of Ptychodus
Volume 20, Page 205
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Synopsis of the Extinct Batrachia of North America
Volume 20, Page 208
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On Agaphelus, a Genus of Toothless Cetacea
Volume 20, Page 221
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Oct. 20th
Volume 20, Page 227
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Notice of Some American Leeches
Volume 20, Page 229
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Sixth Contribution to the Herpetology of Tropical America
Volume 20, Page 305
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Dec. 1st
Volume 20, Page 313
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Dec. 22d
Volume 20, Page 314
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Notice of Some Remains of Extinct Insectivora from Dakota
Volume 20, Page 315
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Observations on Reptiles of the old world
Volume 1868, Page 316
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On the Seed Vessels of Forsythia
Volume 20, Page 334
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Description of Seven New Species of American Birds from Various Localities, with a Note on Zonotrichia melanotis
Volume 20, Page 359
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Notes on the Species of Agonoderus, Bradycellus and Stenolophus Inhabiting America North of Mexico
Volume 20, Page 373
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Correspondence of the Academy for 1868
Volume 20, Page 394
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Donations to the Library, 1868
Volume 20, Page 400
