Manual of Conchology, Vol. 16: Structural and Systematic; With Illustrations of the Species; Philinidæ, Gastropteridæ, Aglajidæ, Aplysiidæ, Oxynoeidæ, ... Pleurobranchidæ (Classic Reprint) - Softcover

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Excerpt from Manual of Conchology, Vol. 16: Structural and Systematic; With Illustrations of the Species; Philinidæ, Gastropteridæ, Aglajidæ, Aplysiidæ, Oxynoeidæ, Runcinidæ, Umbraculidæ, Pleurobranchidæ

II. Head without shield, bearing a pair of enrolled, erect rhino phores, with usually an anterior pair of labial tentacular pro cesses; gill dorsal male and female orifices widely separated.

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