Signetopsis semicircularis (Krause, 1891)

1891     Bollia semicircularis n. sp. — Krause, pp. 497, fig. 31:8-9

1934     Bollia semicircularis Krause — Bassler & Kellett, pp. 219

1954     Signetopsis semicircularis (Krause, 1891) — Henningsmoen, pp. 63-64, fig. 7:10-15