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Additional Costa Rican mosses
Vol 19, Page 11
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A mastodon skeleton near San Francisco Bay
Vol 19, Page 29
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The Cretaceous section in Black Mesa, northeastern Arizona
Vol 19, Page 30
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Middle Devonian pelecypods of Wisconsin and their bearing on correlation
Vol 19, Page 53
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The status of the classification of the trilobites
Vol 19, Page 59
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Trachelocrinus, a new genus of Upper Cambrian, crinoids
Vol 19, Page 63
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A fossil member of the family Pegididae
Vol 19, Page 125
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New Carboniferous Invertebrates. 1
Vol 19, Page 135
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Two new species of "Orthophragmina" from Calita Sal, Peru
Vol 19, Page 142
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Two new larger Radiolaria from Peru
Vol 19, Page 145
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Coleoptera from the lower Fooene (Wilcox) clays
Vol 19, Page 148
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The genus Trimosina and its relationships to other genera of the Foraminifera
Vol 19, Page 155
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The chromotropism of Mermis subnigrescens, nemic parasite of grasshoppers
Vol 19, Page 159
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A new species of Aristida from Florida
Vol 19, Page 195
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Tnitial stratigraphic survey of nemas in the upper 20 mm. (if marine beach sand, near low tide mark
Vol 19, Page 199
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Shorter contributions to the paleontology of the Eocene of northwestern Peru: I. Solitary corals. II. Brachiopods. III. Foraminifer Gypsina
Vol 19, Page 235
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Notes on the ammonite genus Karstenia Hyatt
Vol 19, Page 241
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The ambulatory tubes and other features of the nema Draconema cephalatum
Vol 19, Page 255
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New Asteraceae from the United States, Mexico, and Honduras
Vol 19, Page 268
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A new Antelope Squirrel from Lower California
Vol 19, Page 281
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Observations on the morphology and physiology of nemas ; including notes on new species
Vol 19, Page 283
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A fossil ant from the Lower Bocene (Wilcox) of Tennessee
Vol 19, Page 300
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Three new grasses from French Sudan
Vol 19, Page 303
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New Piperaceae from Central America and Mexico
Vol 19, Page 327
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The development and generic position of Sagrina? tessellata H. B. Brady
Vol 19, Page 337
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Earthworms of North America
Vol 19, Page 339
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Some reef corals from Tahiti
Vol 19, Page 357
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A new Eocene Ledn from Black Bluff, Alabama
Vol 19, Page 425
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Field notes and locality records on a collection of amphibians and reptiles, chiefly from the western half of the United States. I. Amphibians
Vol 19, Page 428
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A new Antelope Squirrel from Arizona
Vol 19, Page 435
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Neoaplectana glaseri, n.g., n.sp. (Oxyuridae), a new nemic parasite of the Japanese beetle (Popillia japonica Newm.)
Vol 19, Page 436
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A new species of Centrolophus from Monterey Bay, California
Vol 19, Page 460
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New species of fossil Decapod Crustaceans from California
Vol 19, Page 469