Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 1-6

Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 7-10

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Published in Proc. Biol. Soc. Washington, in 1938, in volume 51, pages 43-46

Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 47-51

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Published in Proc. Biol. Soc, Washington, in 1938, in volume 51, pages 147-155

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