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Discussion.-This is a minute-eyed, scarcely pigmentedspecies apparently most closely related to D.guatemalensis, known only from the Sierra de Guatemala,Tamaulipas. It is presumably a recent troglobite.It inhabits a slow moving stream which probablyruns through both caves from which the species isknown.Dugesia typhlomexicana Mitchell and KawakatsuDugesia sp. I: Reddell and Mitchell, 1971b:182, fig.1-2; Reddell and Elliott, 1973b:182.Dugesia typhlomexicana Mitchell and Kawakatsu1973a:641, 642-646, 647, 649, 662, 663, 666­671, 673, fig. 1-3, 9, 13-14, 22, 24-27; Mitchelland Kawakatsu, 1973b:168, 169; Reddell and Elliott,1973b:181, 182; Kenk, 1974:22, 28; Kawakatsu,1975:7, fig. 2; Kenk, 1975:113; Kawakatsu,1976:36; Kawakatsu, 1977:17, fig. 3A.Dugesia (part): Reddell, 1973a:32.Dugesia, troglobia: Fernandez Ruiz, 1976:717.Type-locality.-Cueva de la Mina, Municipio deGomez Farias, Tamaulipas, Mexico.Distribution.-Known only from the type-locality.See Fig. 3.Discussion.-This species is closely related to D.barbarae. It has been found only in a small drip poolmid-way down a flowstone-breakdown slope. Thispool was also inhabited by the troglobitic trichoniscidisopod Brackenridgia bridgesi (VanName).Suborder TerricolaFamily BipaliidaeThe only record of this family in Mexico is of asingle specimen of Bipalium, probably referable tothe widespread species B. kewense Moseley. It wasfound in Sotano de Huitzmolotitla, San Luis Potosi.Family GeoplanidaeHyman (1938) described Geoplana multipunctataFuhrmann from Actun Loltlin, Yucatan. A specimenpossibly referable to the genus Geoplana has recentlybeen collected in Actun Sabaca, Yucatan.Family RhynchodemidaeDiporodemus yucatani was described by Hyman(1938) from Actlin Sabaca, Yucatan. Specimensprobably belonging to this species have recently beenfound among leaf litter in the entrance sink of ActlinSabaca. Specimens possibly belonging to the genusRhynchodemus have been collected from Cueva delLencho Virgen, Oaxaca, and So13no del Pozo, SanLuis Potosi.Table 6.-Summary of cave inhabiting Rotifera.TroglobitesOther SpeciesBdelloideaBdelloidaPhilodinidae 0MonogonataFlosculariaceaFlosculariidae 0 1PloimaBrachionidae 0 2Lecanidae 0 2Total 0 6Phylum RotiferaThe only records of rotifers in Mexican caves arethe six species included in the study by Osorio Tafal!(1943) of two caves in the Sierra de EI Abra, San LuisPotosi (see Table 6). Their ecological status is unknown.Class BdelloideaOrder BdelloidaFamily PhilodinidaePhilodina roseola Ehrenberg was collected InCueva de Los Sabinos, San Luis Potosi.Class MonogonontaOrder PloimaFamily BrachionidaeTwo species of this family, Lepadella patella (MUller)and Platyias patulus (Muller), were found inCueva Chica, San Luis Potosi.Family LecanidaeMonostyla closterocerca Schmarda was found inCueva de Los Sabinos, San Luis Potosi. Monostylaquadridentata Ehrenberg was collected in both CuevaChica and Cueva de Los Sabinas, San Luis Potosi.Order FlosculariaceaFamily FlosculariidaeThe only species reported for this family in Mexicancaves is Sinantherina socialis (Linnaeus); it wasfound both in Cueva Chica and Cueva de Los Sabinos,San Luis Potosi.Phylum NematodaAlthough numerous species of nematodes havebeen reported as parasites from the cave inhabitingbats and fishes of Mexico, these do not constitute in73