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pendently by an Italian and by American and Japanesespecialists. Benazzi (1972) published the descriptionof Opisthobursa mexicana in a very briefand uncertain fashion, while a complete descriptionby Mitchell and Kawakatsu (1972) of Dimarcus villalobosiappeared very shortly afterwards. Mitchell andKawakatsu also erected the family Dimarcusidae intheir paper to include this remarkable species. Benazziand Giannini (1974) described the familyOpisthobursidae for the same species. Although thenomenclatorial status of the species is still in doubt,it appears that Benazzi's name has priority. Thefamily Dimarcusidae clearly has priority and is thusthe correct name for the family, with the familyOpisthobursidae falling as a junior synonym to it.Opisthobursa josephinae BenazziOpisthobursa josephinae Benazzi, 1976:533-536, pI. I(fig. 1-2), pI. 2(fig. 3-4); Ball, 1977a:151, 153;Ball, 1977b:27; Pasquini, 1977:3.Opisthobursa (part): Ball, 1977a:154; Ball, 1977b:27,29, fig. 1,3.Type-Iocality.-Pozza Casa Bell, S. Cristobal de lasCasas, Chiapas, Mexico.Distribution.-Known only from the type-locality.See Fig. 3.MEXICOGUATEMALA--~,/Fig. 3.-Distribution of troglobitic and troglophilic planarians: 1, Dugesia barbarae and D. guatemaleruis; 2, D. typh/o.mexicana; 3, Opisthobursa mexicana; 4, O. josephinae; 5, D. mckenzie; 6, Dugesia spp.71