Figure 3. Semi-thin cross-sections of anterior head–foot. (A) Cross-section through body at level of buccal mass (retracted); (B) foot with ciliated sole, subepidermal foot glands (arrowheads indicate upper and lower margins of glandular layer), connective tissue with spicules (asterisks), note crossing muscle fibres; (C) left eye; (D) cross-section through buccal mass with cuticularized pharynx and folded dorsal branch of radula (young branch still separated from pharyngeal cavity); (E) ganglia on the right side of CNS; (F) ganglia on the left side (note giant nerve cells in subg+vg). Abbreviations: bf, basal finger; bs, bursa stalk; bm, buccal mass; cg, cerebral ganglion; dg, digestive gland; dp, diaphragm separating cavities of head–foot and visceral sac; ey, eye; ht, heart; it, intestine; kd, kidney; le, eyelens; nd, nephroduct; oc, odontophore cavity; opt, optic ganglion; osg, tentative osphradial ganglion; ot, oral tube; pag, left parietal ganglion; pc, lumen of pericardium; pg, pedal ganglion; pgl, anterior pedal gland; pgr, granular pigment layer; ph, pharynx; plg, pleural ganglion; pp, loops of paraprostate; ps, lumen of penial sheath; r, radula; sgd, salivary gland duct; sgl, salivary gland; spc, spicules; ssc, sensory cell of eye; ssl, sensory layer; st, statocyst; subg+vg, combined subintestinal and visceral ganglion; supg+pag, combined supraintestinal and right parietal ganglion; vc, long connective between subg+vg and supg+pag. Scale bars: A, 500 µm; B, C, 50 µm; D–F, 100 µm.