(ofHelix hillebrandi Newcomb, 1864)Newcomb, W. (1864). Descriptions of nine new species of <i>Helix</i> inhabiting California. <em>Proceedings of the California Academy of Sciences.</em> (1) 3: 115-119. page(s): 115 [details]
original description(ofHelix hillebrandi Newcomb, 1864)Newcomb, W. (1864). Descriptions of nine new species of <i>Helix</i> inhabiting California. <em>Proceedings of the California Academy of Sciences.</em> (1) 3: 115-119. page(s): 115 [details]