Megasurcula tremperiana (Dall 1911)

Description: English: Megasurcula tremperiana (Dall, 1911); family Pseudomelatomidae; California. Date: 1921. Source: Dall, William Healey. Summary of the marine shellbearing mollusks of the northwest coast of America: from San Diego, California, to the Polar Sea, mostly contained in the collection of the United States National Museum, with illustrations of hitherto unfigured species. No. 112. Govt. print. off., 1921 pl. 12 # 5. Author: W.H. Dall.