AbstractMarcus, Eveline du Bois‐Reymond (Caixa Postal 6994, 01000 Sao Paulo, Brazil).A toxonomic survey of the genusToledonia (Opisthobranchia, Diaphanidae). Zool. Scr. 5 (1): 25–33, 1976.—Nineteen species certainly or probably belonging to the genusToledoniaDall have been listed and discussed with regard to their anatomy, taxonomy and zoogeography. A complete specimen ofAceton bullatus(Gould, 1847) was studied. On the basis of the radula and the retractile penis the species was transferred to the diaphanid genusToledoniaDall. Own studies were also carried out on material ofT. limnaeoides(Odhner,