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. See Plate P4, 1-15.