Plate P2. Scanning electron micrographs of calcareous nannofossils from Sample 173-1069A-16R-3, 129 cm, except for figure 3. 1, 2. Partially etched specimens showing inner cores of the conusphaerids. (figs. 2, 4, and 5 are from Wilson et al., in press.) Conusphaera mexicana mexicana, lateral view.