Fig. 7From: Siphonal zone structure in the cuttlebone of Sepia officinalis Sepia officinalis. Beach-collected cuttlebone; Vale do Lobo, southern Portugal. Ventral side of cuttlebone showing three globular crystalline units in contacting ridge and their microlaminated ultrastructure. Scale bar is 50 µm. cr contacting ridge, g globular crystalline unitBack to article page