Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 11-12

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 14-17

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 24-54

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 55-71

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 72

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 77

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 89-119

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 124-128

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 139

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 140-152

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 244-254

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 271

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 367-399

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 400-403

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 415-416

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 440

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1875, in volume 27, pages 444-449

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 463-464

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 470-502

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 503-505

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 508-514

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 515-517

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1875, in volume 27, pages 517-518

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1875, in volume 1875, pages 10-11