Fig. 6
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 interstices between four succeeding contacting ridges filled with the microgranular material in siphonal zone. Scale bar is 500 µm. cr contacting ridge, g granular crystalline units, gf granular filing of “openings” of cameras, pi pillar structure