Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1904, in volume 55, pages 727-742

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1904, in volume 55, pages 754-755

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 3-37

Published in Proc Acad. Nat. Sci. Philad., in 1904, in volume 56, pages 38-107

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 119

Published in Proc. Acad. nat. Sci. Philad., in 1904, in volume 56, pages 120-147

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 148-156

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 157-179

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 180

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 222-238

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 239-240

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 242-249

Published in Proc. Acad. nat. Sci. Philad., in 1904, in volume 56, pages 261-325

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 324

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 481-483

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 504-512

Published in Proceedings of the Academy of Natural Sciences of Philadelphia (Proc. Acad. Nat. Sci. Philad.), in 1904, in volume 56, pages 513-549

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1904, in volume 56, pages 562-575

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 586-591

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 592-595

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 642-650

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 651-657

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 684-685

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 687-737

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 756

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 772-773

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1904, in volume 56, pages 774-802

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 841-842

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1904, in volume 56, pages 848-854