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The Genera of the Enchytraeidae (Oligochaeta)
Vol 39, Page 25
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An Ecological Study of the Algae of Some Sandhill Lakes
Vol 39, Page 51
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Leeches Considered as Oligochaeta Modified for a Predatory Life
Vol 39, Page 86
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Modern Dark-Field Microscopy and the History of Its Development
Vol 39, Page 95
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A New Bladder Fluke from the Frog
Vol 39, Page 142
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Labeling Illustrations
Vol 39, Page 149
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Entomological Abstracts
Vol 39, Page 163
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Protozoa of the Devil's Lake Complex, North Dakota
Vol 39, Page 167
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Age, Growth and Scale Characters of the Mullets, Mugil cephalus and Mugil curema
Vol 39, Page 199
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Micro-Technique: Suggestions for Methods and Apparatus
Vol 39, Page 231
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Acanthocephala from the eel
Vol 40, Page 1
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A Brief Study of the Range of Error in Micro-Enumeration
Vol 40, Page 14
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Remarks on the Life-History and the Scale Characters of American Mullets
Vol 40, Page 26
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Spring Migration in the Crayfish, Cambarus argillicola Faxon
Vol 40, Page 28
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Preparing Collections of the Mollusca for Exhibition and Study
Vol 40, Page 31
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On the Nature of Structures Characteristic of Cnidosporidian Spores
Vol 40, Page 59
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Recent Advances in Parasitology
Vol 40, Page 75
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A Method for Orienting and Mounting Microscopical Objects in Glycerine
Vol 40, Page 89
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Observations on the Distribution and Life History of Cephalobium microbivorum Cobb and of Its Host, Gryllus assimilis Fabricius
Vol 40, Page 97
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A Sarcophagid Parasite of the Common Field Cricket
Vol 40, Page 116
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Fresh Water and Marine Gymnostominan Infusoria
Vol 40, Page 118
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Copper: Its Occurrence and Rôle in Insects and Other Animals
Vol 40, Page 144
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Microscope Illumination with Reference to Brownian Movement and Combination Lighting
Vol 40, Page 158
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On the Effect of Some Fixatives upon Myxosporidian Spores
Vol 40, Page 161
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New Species and Collections of Arrhenuri: 1921
Vol 40, Page 168
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Some Work on Marine Phytoplankton in 1919
Vol 40, Page 177
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The Accessory Chromosome of Anasa tristis Again
Vol 40, Page 182
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The Literature of Diatoms
Vol 40, Page 187
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A Compendium of the Hosts of Animal Parasites Contained in Ward and Whipple's Fresh-Water Biology
Vol 40, Page 195