Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1882, in volume 34, pages 15-16

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1882, in volume 34, pages 16

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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1882, in volume 34, pages 375-397

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1882, in volume 1882, pages 12-14

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1882, in volume 1882, pages 272-284