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  1. By: Higgins, H T
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 53
    Date: 1901
    Page Range: 126--141
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,
  2. By: Higgins, H T
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 15
    Series: 4
    Date: 1875
    Page Range: 377--390
    Publication Info: London Taylor and Francis, Ltd