Recently we had the opportunity to investigate the radulae of several Simpulopsis species which in part were described by one of us (Breure, 1975). It now appears that the structure of the radula is quite variable within this genus. Material of Simpulopsis pseudosulculosa, S. wiebesi and S. araujoi was collected by F. Plaumann in Brazil, State of Santa Catarina, Nova Teutonia. The specimens were received on loan from the Naturhistoriska Riksmuseet, Stockholm (NRS 2503, 2505 and 2442 respectively). Simpulopsis citrinovitrea was collected by A.S.H. Breure in Ecuador, Province Pichincha, 59 km W.Machachi, 1250 m, on leaves in cloud forest.