Fig. 5 in The tube wall of Cambrian anabaritids

Fig. 5. Jacutiochrea tristicha (Missarzhevsky), specimen SMNH X3409 (same as in Figs. 2 and 3), sample K2/25. A. Close−up of area marked in Fig. 3A, showing apatite encrusting the internal surface of the tube (wall missing in figured window). B. Close−up of A, showing hexagonal apatite tablets. C. Close−up of B, showing individual tablet.