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  1. By: Herbert, G S - Portell, R W
    Type: Article
    In: The veliger
    Volume: 45
    Date: 2002
    Page Range: 303--308
    Publication Info: Berkeley, CA, California Malacozoological Society,
  2. By: Portell, R W - Collins, J. S. H.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 115
    Date: 2002
    Page Range: 594--599
    Publication Info: Washington, Biological Society of Washington,