Published in Proceedings of The Biological Society of Washington, in 1930, in volume 43, pages 1-2

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Published in Proceedings of The Biological Society of Washington, in 1930, in volume 43, pages 55-64

Published in Proceedings of the Biological Society of Washington, in 1930, in volume 43, pages 65-71

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Published in Proc. Biol. Soc. Wash., in 1930, in volume 43, pages 137-144

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