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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 93-118

Published in Proc. Acad. nat. Sci. Philadelphia, in 1869, in volume 1868, pages 316-323

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 180

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 189-190

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 245-249

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 121-122

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 237-238

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 1-21

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1869, in volume 21, pages 218-234