FIGURE 15. Stenotheca drepanoida (He and Pei in He et al., 1984) from the early Cambrian of Australia (1-16), and Stenotheca drepanoida? from the early Cambrian of Siberia (17). All specimens from L1876 (Bengtson et al. 1990) except 9, 11 and 16 (from L1852—Bengtson et al. 1990), 13 (from L1874—Bengtson et al. 1990), and 17 (locality 96-7/70; Botoman Stage; Kouchinsky 2000a). 1-3, holotype, SMNH Mo167620, early Cambrian of Australia, L1876 (Bengtson et al. 1990). 4-6, SMNH Mo167621, early Cambrian of Australia, L1876. 7, SMNH Mo167622. 8, SMNH Mo167623. 9, SMNH Mo167624. 10, SMNH Mo167625. 11, SMNH Mo167626. 12, SMNH Mo167627. 13, SMNH Mo167628. 14, SMNH Mo167629. Arrows show locations of imprints of crystal tablet faces. 15, SMNH Mo167630. 16, SMNH Mo167631. 17, SMNH Mo167632, early Cambrian of Siberia. All scale bars are 200 µm except 5 with scale bar of 100 µm and 14 with scale bar of 5 µm.