Published in Proceedings of The American Philosophical Society, in 1869, in volume 11, issue 81, pages 85-90

Created: 2017-01-01, modified: 2017-01-01

Published in The Wilson Bulletin, in 1894, in volume 6, issue 4, pages 6

Created: 2016-11-27, modified: 2016-11-27

Published in The Wilson Bulletin, in 1983, in volume 95, issue 2, pages 243-255

Created: 2017-08-22, modified: 2017-08-22

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

Created: 2013-03-02, modified: 2013-03-02