Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 29

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 45

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 49

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 53-69

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 78-80

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 90

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 91-94

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 95

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 98-101

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 129

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 134-135

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 156-158

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 166-168

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 169-179

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 188-189

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 189-190

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 258-265

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 271-273

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 277-279

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 283

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 303-311

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 311-312

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 313-340

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 344

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 347

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 348

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 349-407

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 408-409

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 410

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 411-416

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 417-420

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 433-434

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 440

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 442-444

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, issue 2, pages 280-281

Published in Proceedings of the Academy Philadelphia, in 1889, in volume 1889, pages 127-129

Published in Proc. Acad. nat. Sci. Philad., in 1889, in volume 1889, pages 341-343