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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
    Date: 1908
    Page Range: 403--405
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  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
    Date: 1908
    Page Range: 345--389
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  3. 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
    Date: 1907
    Page Range: 525--546
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