Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 157-162

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Published in Proc. Biol. Soc. Wash., in 1921, in volume 34, pages 139-142

Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 143-146

Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 85-88

Published in Proc. Biol. Soc. Wash, in 1921, in volume 34, pages 81-84

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 149-154

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 23-24

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 89-92

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Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 43-46

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 115-117

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Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 109-110

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 1-21

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 47-48

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 111-113

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 67-75

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 93-104

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 49-50

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 78-79

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 105-107

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 136-137

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 163-166

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 63-66

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Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 121-122

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 173-192

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 147-148

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 59-61

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 167-171

Published in Proceedings of the Biological Society of Washington, in 1921, in volume 34, pages 157-162

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 77

Published in Proceedings of The Biological Society of Washington, in 1921, in volume 34, pages 135