Published in Proceedings of the Biological Society of Washington, in 1981, in volume 93, pages 875-886

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Published in Proceedings of The Biological Society of Washington, in 1981, in volume 93, issue 4, pages 1035-1079

Published in Proceedings of the Biological Society of Washington, in 1981, in volume 94, pages 18-36

Published in Proceedings of The Biological Society of Washington, in 1981, in volume 94, pages 37-42

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Published in Proc. Biol. Soc. Wash, in 1981, in volume 94, pages 1279-1305

Published in Proceedings of The Biological Society of Washington, in 1981, in volume 94, issue 1, pages 1-17

Published in Proceedings of the Biological Society of Washington, in 1981, in volume 94, issue 2, pages 525-534

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