FIG. 17 in Notes on astogeny of some Petraliellidae (Bryozoa) from Australia

FIG. 17. Hippopetraliella magna (d'Orbigny): Townsville, Queensland. Scanning electron micrographs of skeleton of ancestrula. (A, B) Frontal views, showing opesia, vertical interior walls and proximal processes. (C) Lateral view. (D) Basal view, showing exterior basal wall with paired proximal processes and fracture holes marking position of distal processes. Scale: 0.15 mm.