Series volume

Marcus, Ev. & Marcus, Er. 1967. No. 6. American Opisthobranch Mollusks. Stud. Trop. Oceanogr. Miami, Dec 1967: 1-256. ≡

Articles

1. Marcus, Ev. & Marcus, Er., 1967. Part I. Tropical American Opisthobranchs: 1-137, figs. 1-155.
2. Marcus, Ev. & Marcus, Er., 1967. Part II. Opisthobranchs from the Gulf of California: 139-256.