Published in Proceedings of the Biological Society of Washington, in 1949, in volume 62, pages 1-2

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Published in Proceedings of The Biological Society of Washington, in 1949, in volume 62, pages 29-30

Published in Proceedings of The Biological Society of Washington, in 1949, in volume 62, pages 33-44

Published in Proceedings of The Biological Society of Washington, in 1949, in volume 62, pages 57-68

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Published in Proceedings of The Biological Society of Washington, in 1949, in volume 62, pages 73-77

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Published in Proc. Biol. Soc. Washington, in 1949, in volume 62, pages 165-168

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Published in Proceedings of The Biological Society of Washington, in 1949, in volume 62, pages 177-181