Female Nautilus without Shell

An illustration of the postero-ventral view female nautilus without the shell. “a, Muscular band passing from the mid-foot to the integument; b, The valve on the surface of the funnel, partially concealed by the inrolled lateral margin of the latter; c, The mantle-skirt retroverted; an, The median anus; x, Post-anal papilla of unknown significance; g.n., Nidamental gland ; r.ov, Aperture oft he right oviduct; l.ov, Aperture of the rudimentary left oviduct; neph.a, Aperture of the left anterior renal sac; neph.p, Aperture of the left posterior renal sac; viscper, Left aperture of the viscero-pericardial sac; olf, The left osphradium placed near the base of the anterior gill-plume.” (Britnnica, 1910)

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