Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, issue 3, pages 603-612

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1910, in volume 62, pages 464-467

Published in Proceedings of the Academy of Natural Sciences of Philadelphia (Proc. Acad. Nat. Sci. Philad.), in 1910, in volume 62, pages 585-598

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1910, in volume 62, pages 3-11

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1910, in volume 62, pages 615-650

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 490-501

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 468-475

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 148

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 271-272

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 273-293

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 294-327

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 460-463

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 536

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 502-509

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 328-402

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 538-540

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 599-602

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 689

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 680-683

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 454-455

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 651-654

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 476-486

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 12-17

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 403-406

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 690

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 254

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 149

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1910, in volume 62, pages 255-270