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  1. By: Butler, Gerard W
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1895
    Date: 1895
    Page Range: 691--712
    Publication Info: London Academic Press, [etc.] 1833-1965
  2. By: Butler, Gerard W
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1889
    Date: 1889
    Page Range: 602--613
    Publication Info: London Academic Press, [etc.] 1833-1965
  3. By: Butler, Gerard W
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1889
    Date: 1889
    Page Range: 452--474
    Publication Info: London Academic Press, [etc.] 1833-1965