. Allan Hancock Pacific expeditions. Scientific expeditions. Fig. 5. Choromyiilus chorus (Molina). Chile. No anterior adductor, anterior retractor distant from umbo. Fig. 6. Perna perna (Linne). Magellan Straits (Videnskabs- selskabets Museum, Trondheim, Norway). Posterior re- tractors widely separated. Fig. 7. Crenomytilus grayanus (Dunker). Japan (San Diego Mu- seum). Strong anterior adductor. Fig. 8. Semimytilus algosus (Gould). North Chincha Island, Peru. Anterior retractor shows two scars. Fig. 9. Semimytilus algosus (Gould). North Chincha Island, Peru. Anterior part seen from the ventral


. Allan Hancock Pacific expeditions. Scientific expeditions. Fig. 5. Choromyiilus chorus (Molina). Chile. No anterior adductor, anterior retractor distant from umbo. Fig. 6. Perna perna (Linne). Magellan Straits (Videnskabs- selskabets Museum, Trondheim, Norway). Posterior re- tractors widely separated. Fig. 7. Crenomytilus grayanus (Dunker). Japan (San Diego Mu- seum). Strong anterior adductor. Fig. 8. Semimytilus algosus (Gould). North Chincha Island, Peru. Anterior retractor shows two scars. Fig. 9. Semimytilus algosus (Gould). North Chincha Island, Peru. Anterior part seen from the ventral side, showing the fold on the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allan Hancock Foundation. Los Angeles : Allan Hancock Foundation for Scientific Research, University of Southern Calif. Press


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