Figure 1. (1–3) Lectotype of Perisphinctes aberrans Waagen, 1875. GSI type no. 2045. Adult phragmocone from the ‘Athleta beds’ (=upper Callovian); (1) lateral, (2) apertural, (3) ventral views. (4–6) Holotype of Perisphinctes spirorbis Waagen 1875. GSI type no. 2043. Adult body chamber with missing peristome from the ‘Golden Oolite’ (=lower Callovian); (4) lateral, (5) apertural, (6) ventral views. X = Beginning of body chamber. All ×0.5.