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A new Callianassa from the Cretaceous of South Dakota
Vol 20, Page 1
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A Long Lost Phlox
Vol 20, Page 25
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The Cretaceous faunas in the section on Vermilion Creek Moffat County, Colorado
Vol 20, Page 35
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A Cretaceous pelecypod with color markings
Vol 20, Page 59
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A new Racoon from Lower California
Vol 20, Page 82
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A new Murine Opossum from Argentina
Vol 20, Page 83
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Parasites of elk and other wild ruminants
Vol 20, Page 87
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Descriptions of two new Amphipod Crusta ceans (Talitridae) from the United States
Vol 20, Page 107
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Leafhopper injury to Legumes
Vol 20, Page 116
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The demanian vessels in nemas of the genus Oncholaimus; with notes on four new Oncholaims
Vol 20, Page 225
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The mechanism of organic evolution
Vol 20, Page 317
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Remarks on Dr. George G. Simpson's work on the Pleistocene paleontology of Florida
Vol 20, Page 331
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Myxamoebae in soil and decomposing crop residues
Vol 20, Page 362
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Discovery of Permo-Carboniferous vertebrates in the Dunkard formation of West Virginia
Vol 20, Page 370
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A new species of Calathea from Panamá
Vol 20, Page 372
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Ten new species of Passiflora, mainly from Colombia and Peru
Vol 20, Page 374
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Four new grasses
Vol 20, Page 381
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The interrelation of Foraminifera and Algae
Vol 20, Page 395
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A new cannon-ball tree from Panama
Vol 20, Page 396
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Some new species of Pythium
Vol 20, Page 398
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Paleozoic formations in the Gold Hill quadrangle, Utah
Vol 20, Page 421
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Contributions to the palaeontology of Peru, IV: Orthophragmina (Discocyclina) meroensis W. Berry, n. sp
Vol 20, Page 432
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The geographic variations of Neocichla gutturalis (Bocage)
Vol 20, Page 434
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Mosses collected in Brazil and Argentina by J. N. Rose in 1915
Vol 20, Page 465
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The genus Trichanthera
Vol 20, Page 484
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New Coccinellidae from the West Indies
Vol 20, Page 488
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On the fossil Mammalia of the first interglacial stage of the Pleistocene of the United States
Vol 20, Page 501