Types. A–B. Holotype of Bulla macrostoma, H 26.2 mm, ANSP IP30727. C–D. Holotype of Bullopsis cretacea, H 18.0 mm, ANSP IP18924. E–F. Holotype of Retusa biforis, H 2.9 mm, ANSP IP3192. G. Paralectotype of Retusa galba, H 14.3 mm, ANSP IP53816. H. Lectotype of Retusa galba, H 15.0 mm, ANSP IP30548. I–J. Lectotype of Retusa sthillairii, H 14.0 mm, ANSP IP5486. K. Syntype of Retusa subspissa, H 4.8 mm, ANSP IP30641. L. Holotype of Volvulella cylichnoides, H 4.2 mm, ANSP IP3177. M–N. Syntype of Volvulella cylindrica, H 4.7 mm, ANSP IP3179.