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  1. By: Simpson, Charles T
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 18
    Issue: 1068
    Date: 1896
    Page Range: 295--343
    Publication Info: Washington Smithsonian Institution Press, [etc.]
  2. By: Simpson, Charles T
    Type: Article
    In: Proceedings of the Academy of Natural Sciences of Philadelphia
    Volume: 52
    Date: 1900
    Page Range: 74--86
    Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,
  3. By: Simpson, Charles T
    Type: Article
    In: Proceedings of the United States National Museum
    Volume: 15
    Issue: 911
    Date: 1892
    Page Range: 405--436
    Publication Info: Washington Smithsonian Institution Press, [etc.]