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  1. Description of a new brittle star from the Upper Miocene of the Santa Cruz Mountains, California
    By: Arnold, Ralph
    Type: Article
    In: Proceedings of the United States National Museum.
    Volume: 34
    Issue: 1620
    Date: 1908
    Page Range: 403--405
    Publication info: Washington :Smithsonian Institution Press, [etc.]
    View Article
  2. Descriptions of new Cretaceous and Tertiary fossils from the Santa Cruz Mountains, California
    By: Arnold, Ralph
    Type: Article
    In: Proceedings of the United States National Museum.
    Volume: 34
    Issue: 1617
    Date: 1908
    Page Range: 345--389
    Publication info: Washington :Smithsonian Institution Press, [etc.]
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  3. New and characteristic species of Fossil Mollusks from the Oil-bearing Tertiary Formations of Santa Barbara County, California
    By: Arnold, Ralph
    Type: Article
    In: Smithsonian miscellaneous collections.
    Volume: 50
    Date: 1908
    Page Range: 419--447
    Publication info: Washington :Smithsonian Institution,1862-1972.
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  4. New and characteristic species of fossil mollusks from the oil-bearing Tertiary formations of southern California
    By: Arnold, Ralph
    Type: Article
    In: Proceedings of the United States National Museum.
    Volume: 32
    Issue: 1545
    Date: 1907
    Page Range: 525--546
    Publication info: Washington :Smithsonian Institution Press, [etc.]
    View Article