Fig. 1. Representative SEM micrographs of cement disks on 0.5 mm glass beads removed from a reconstructed P. californica tube. (A) Intact cement disks on beads separated from a section of reconstructed tube in a hydrated state. Scale bar, 100 µm. (B,C) Fractured cement disks on beads separated after lyophilization. Scale bars, 10 µm.