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Table 4.-Summary of cave inhabiting Protozoa.TroglobitesOther SpeciesRhizopodeaAmoebidaAmoebidae 0 1ActinopodeaHeliozoidaActinophryidae 0 1ArcellinidaArcellidae 0 1Difflugiidae 0 1ZoomastigophoreaKinetoplastidaTrypanosomatidae 0 3CiliateaGymnostomatidaColepidae 0 1PeritrichidaVorticellidae 0 1Total 0 9Class CiliateaOrder GymnostomatidaFamily ColepidaeColeps sp. d. hirtus (Muller) was collected fromCueva Chica, San Luis Potosi.Order PeritrichidaFamily VorticeUidaeVorticella sp. cf. microstoma Ehrenberg was collectedin Cueva Chica, San Luis Potosi.Phylum PoriferaClass DemospongiaeOrder HaplosderinaFamily SpongiUidaePenney and Racek (1968) described Spongillacenota from Cenote Grande de Xanaba and CenoteXtolok, Yucatan. These two cenotes contain largeopen-air bodies of water, and the sponge recoveredfrom them is certainly not a part of the true cavefauna.Phylum CnidariaClass HydrozoaOrder HydroideaFamily HydridaeOsorio Tafall (1943) reported an unidentified speciesof Hydra from Cueva de Los Sabinos, San LuisPotosi. This is surely a form washed into the cavefrom the surface.Phylum PlatyhelminthesThe phylum Platyhelminthes is represented incaves both by free-living members of the class Turbellariaand by numerous species of parasite of theclasses Trematoda and Cestoda (see Table 5). Theparasites have been found in bats, fishes, and amphibians;they are not discussed further since they arenot a part of the true cave fauna.Class TurbellariaOrder TricladidaThe triclad turbellarian fauna of Mexican caves ispoorly known in comparison to that of the UnitedStates. Many collections have been made recently inMexican and Guatemalan caves, and once this materialhas been studied we will have a far better conceptof the nature and relationships of the Mexicanand Central American troglobitic and troglophilicplanarian fauna.Suborder MaricolaFamily DimarcusidaeOne of the more exciting events in recent years inMexican cave biology was the description of the firstmarine relict troglobitic flatworms. Unfortunately,the first species was discovered and described inde-Table 5.-Summary of cave inhabiting Platyhelminthes.TroglobitesOther SpeciesTurbellariaTricladidaMaricolaDimarcusidae 2 0PaludicolaDugesiidae 3 1TerricolaBipaliidae 0 1Geoplanidae 0 1Rhynchodemidae 0 2TrematodaDigeneaAcanthostomidae 0 1Allocreadidae 0 IAnenterotrematidae 0 2Clinostomidae 0 1Hemiuridae 0 1Lecithodendriidae 0 4Plagiorchiidae 0 1Strigeidae 0 1Urotrematidae 0 1CestodaCyclophyllideaAnoplocephalidae 0 1PseudophyllideaBothriocephalidae 0 1Total 5 2070