Figure 4. Pilophyllia involuta Ge and Yu, 1974, type species of Pilophyllia, holotype: (1–4) transverse section (NIGP 22131) and three enlarged portions (2–4), with white arrows in (2) indicating where septa are interrupted; (5, 6) longitudinal section (NIGP 22132) and an enlarged portion (6). Scale bars=2mm.