Fig. 11From: Siphonal zone structure in the cuttlebone of Sepia officinalis Spirula. Beach-collected shell; Sydney, Ausralia. Slit-like permeable zone in tubular siphuncle with long retrochoanitic septal neck. Scale bar is 250 µm. rsn retrochoaniticseptal neck, s septum, sp slit-like permeable pillar zoneBack to article page