Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 187-224

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 414-418

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 13-19

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 296-309

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 278-279

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 279

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 40-127

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 281