Eyes of Mollusca

Diagrams of Sections of the Eyes of Mollusca. A, Nautilus (and Patella). B, Gastropod (Limax or Helix). C, Dibranchiate Cephalopod (Oigopsid). Pal, Eyelid (outermost fold). Co, Cornea (second fold). Ir, Iris (third fold). Int1,2,3,4, Different parts of the integument. l, Deep position of the lens. l1, Outer portion of the lens. Co.ep, Ciliary body. R, Retina. N.op, Optic nerve. G.op, Optic ganglion. x, Inner layer of the retina. N.S, Nervous stratum of the retina. (From Balfour, after Grenacher.)
Source: 1911 Encyclopedia Britannica, Vol. 5, p. 692

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