Fig. 1. Shell of S. obliquata; ventral view, mt, muscle impressions and tracts, showing successive position of the muscles as the animal grows; sn, siphonal notch.
Fig. 2. Dorsal view of S. obliquata, with pallial chamber opened and mantle turned to the left; x 2. a, anus; af.br.v, afferent branchial vein; ef.pul.v, efferent pulmonary vein; g, gill; dk, dorsal part of kidney; l, lung; ms, muscle-fibres of floor of pallial chamber; me, free mantle-edge; pm, pallial muscles; rp, renal papilla; r′, respiratory orifice leading into pallial chamber; vk, ventral part of kidney; ef.br.v, efferent branchial vein; ar.v, anterior renal vein; af.pul.v, afferent pulmonary vein.
Fig. 3. Body-cavity opened by cutting through the floor of the pallial chamber, showing internal organs in situ; x 2 a, anus; bm, buccal mass; bw, body-wall pinned aside; cd, common duct; dg, digestive gland; hg, hermaphrodite gland; i, intestine; oe, oesophagus; p, penis; pro, prostate; r, rectum; sg, salivary gland; st, stomach; sth, spermotheca; sthd, spermotheca duct.