Published in Proc. Acad. Nat. Sci. Philadelphia, in 1883, in volume 35, pages 10-35

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1883, in volume 35, pages 44-46

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1883, in volume 35, pages 55-56

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1883, in volume 35, pages 338