Plate P4. 1, 2, 3, 4. Hemiplacophora sp. A sample/slide, Sample 171B-1053A-2H-4, 125-130 cm/I. (1) H36; (2, 3) J46; (4) B27. Figures 2 and 3 are to the same scale as Figure 1. 5, 6. Hemiplacophora semilunifera sample/slide, Sample 171B-1053A-18X-4, 117-120 cm/I (T51). Figure 6 is to the same scale as Figure 5. 7, 8, 9. Schematophora speciosa sample/slide, Sample 171B-1053A-15H-4, 125-130 cm/I (H37). Figures 8 and 9 are to the same scale as Figure 7. 10. Systematophora ancyrea sample/slide, Sample 171B-1053A-15H-4, 125-130 cm/I (N50). 11, 12. Systematophora placacantha sample/slide, Sample 171B-1053A-2H-4, 125-130 cm/I (G28). Figure 12 is to the same scale as Figure 11. 13. Samlandia chlamydophora sample/slide, Sample 171B-1053A-2H-4, 125-130 cm/I (C45). 14, 15. Samlandia chlamydophora sensu Stover and Hardenbol 1994 sample/slide, Sample 171B-1053A-14H-4, 125-129 cm/I (P26). Figure 15 is to the same scale as Figure 14. Click on image for close-up.