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Ocythoe tuberculata hectocotylus
Top image: Tip of hectocotylus with the penis-sac collapsed and penis extended. Bottom image: Detached hectocotylus with most of the penis in the penis-sac and just the tip of the penis emerging. Note the opening of the sperm duct at the opposite end of the arm.
Originally published in: Naef, A. (1921-23). Cephalopoda. Fauna und Flora des Golfes von Neapel. Monograph, no. 35. English translation: A. Mercado (1972). Israel Program for Scientific Translations Ltd., Jerusalem, Israel. 863pp., IPST Cat. No. 5110/1,2.
Source: http://tolweb.org/accessory/Ocythoe_additional_features?acc_id=2459
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