1. Sepia officinalis. Cuttlebone, 1: sheet (0.6mm) of translucent, horny-yellow, conchiolin, only visible at edges until erosion of 2: white, hard, rugose, calcareous, dorsal layer (0.7mm) with many growth lines; Jly 1968. Strandline, Port Mary, Kircudbright
2. Sepia officinalis. Cuttlebone, 1: sheet (0.6mm) of translucent, horny-yellow, conchiolin, only visible at edges until erosion of 2: white, hard, rugose, calcareous, dorsal layer (0.7mm) with many growth lines; Jly 1968. Strandline, Port Mary, Kircudbright

Sepia officinalis. Cuttlebone, 1: sheet (0.6mm) of translucent, horny-yellow, conchiolin, only visible at edges until erosion of 2: white, hard, rugose, calcareous, dorsal layer (0.7mm) with many growth lines; Jly 1968. Strandline, Port Mary, Kircudbright