Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 1-3

Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 5-14

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Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 57-61

Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 63-65

Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 67-82

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Published in Proceedings of the Biological Society of Washington, in 1960, in volume 73, pages 87-94

Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 95-98

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Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 107-117

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Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 195-196

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Published in Proceedings of The Biological Society of Washington, in 1960, in volume 73, pages 275-279

Published in Proceedings of the Biological Society of Washington, in 1960, in volume 73, pages 281-286