Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 1-10

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 21-26

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 29-34

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 41-49

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Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 55-58

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 59-62

Published in Proceedings of the Biological Society of Washington, in 1956, in volume 69, pages 63-64

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 69

Published in Proceedings of the Biological Society of Washington, in 1956, in volume 69, pages 71-82

Published in Proceedings of the Biological Society of Washington, in 1956, in volume 69, pages 83-87

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Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 93-103

Published in Proceedings of The Biological Society of Washington, in 1956, in volume 69, pages 105-113

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Published in Proceedings of the Biological Society of Washington, in 1956, in volume 69, pages 227-229