Fig. 4
From: Siphonal zone structure in the cuttlebone of Sepia officinalis
Sepia officinalis. Beach-collected cuttlebone; Vale do Lobo, southern Portugal. Ventral side of cuttlebone showing the contacting ridge (in the middle) and organic (above the ridge) and inorganic–organic (below the ridge) portions of two connecting stripes attached to the contacting ridge on both sides. Scale bar is 200 µm. cr contacting ridge, cs connecting stripe, pi pillar structure