Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 1-20
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 25-31
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 33-34
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 37-40
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 41-44
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 45-53
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 55-57
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 59-64
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 65-67
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 69-70
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 71-75
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 77-82
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 83-84
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 85-87
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 89-90
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 91-92
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 93-96
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Published in Proc. Biol. Soc. Washington, in 1920, in volume 33, pages 97-100
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 101-102
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 103-106
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 107-111
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 113-115
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 117-120
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 121-126
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Published in Proc. Biol. Soc. Washington, in 1920, in volume 33, pages 127
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Published in Proceedings of the Biological Society of Washington, in 1920, in volume 33, pages 129-138
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 139-170
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 171-176
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 177-179
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 181-182
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Published in Proceedings of The Biological Society of Washington, in 1920, in volume 33, pages 183-185
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