Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 9-10

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 11

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 51

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1871, in volume 23, pages 55

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 91-93

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 101

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 102

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1871, in volume 23, pages 112-113

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 117-119

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1871, in volume 23, pages 149-153

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 157-158

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 158

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 185-187

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 198

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1871, in volume 23, pages 200-224

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 228-230

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 233-237

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 297-298

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 299-304

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 305-307

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 308-336

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 337-338

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 341

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1871, in volume 23, pages 343-346

Published in Proc. Acad. Nat. Sci. Philad, in 1871, in volume 1871, pages 12-48