Published in Proc. Acad. Nat. Sci. Philadelphia, in 1893, in volume 1893, pages 181-184

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1893, in volume 1893, pages 386-387

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1893, in volume 1893, pages 429-435

Published in Proceedings Academy Natural Sciences Philadelphia, in 1893, in volume 1893, pages 377-382

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1893, in volume 1893, pages 104-127

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 440-466

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 197-200

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 310-312

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 565-566

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 194-196

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 563

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 388-400

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 285-287

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 288

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 282-284

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 66-67

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 226

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 68-74

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 401

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 218

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 201

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 362-363

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 404-412

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 556-558

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 555-556

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 361

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, pages 185-187

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1893, in volume 45, issue 3, pages 364-372