Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 91-133

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 134

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 145

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 146-152

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 161-165

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 168

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 204-226

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 288-289

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 290-298

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 299-302

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 303-312

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 333

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 356

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 368-372

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 465-476

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 503-504

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 505-518

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 522-529

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 539-542

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 542-545

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 549-550

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 552

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 555-556

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1897, in volume 49, pages 557-564

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1897, in volume 1897, pages 360-367