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is a cosmopolitan species. Clarkus venezolanus(Loo!), previously known only from Venezuela, wascollected from slime in Sima del Ojito, Chiapas (Zullini,1974). Mononchus sp. and Mylonchulus sigmaturus(Cobb) were found in Grutas de Zapaluta, Chiapas(Zullini, 1977). Mylonchulus sigmaturellus Mulveywas taken in Cenote Xtojil, Yucatan, and Mylonchuluslacustris (Cobb) was found in a well at Tamhek,Yucatan (Zullini, 1977).Family TripylidaeTwo species of this family were reported fromcaves in Chiapas by Zullini (1974). Trischistoma monhystera(de Man), previously known only from Italy,Germany, and Sumatra, was collected in Cueva delPanteon, Chiapas. Tripyla tenuis Brzeski was found insediment in Cueva Chorreadero, Chiapas. Zullini(1977) reported Trischistoma arenicola (de Man)from Cenote Xtojil, Yucatan.Order DorylaimidaFamily DorylaimidaeChitwood (1938) described Dorylaimus yucatanensisfrom Cueva Luchil, Yucatan. This species hassince been placed in the synonymy of Eudorylaimusgranuliferus (Cobb). Zullini (1974) reported Mesodorylaimusbastiani (Biitschli) from mud in Cueva delPanteon, Chiapas. Zullini (1977) reported four additionalspecies of this family from wells and cenotes inYucatan and Tabasco. He also reported Mesodorylaimussp. and Aporcelaimellus sp. from guano-rich mudin Grutas de Zapaluta, Chiapas.Phylum EctoproctaClass PhylactolaemataOrder PhylactolaemataFamily PlumatellidaeLacourt (1968) reported two species of the bryozoangenus Plumatella from cenotes in Yucatan: P.emarginata Allman from Cenote Xtolok and P. evelinae(Marcus) from Cenote del Country Club. Bothcenotes are large and open, and these species certainlyare not a part of the true cave fauna.Phylum AnnelidaClass CliteUataOrder BranchiobdellidaFamily BranchiobdellidaeThe branchiobdellid worms are commensals ofcrayfishes and isopods. Two species are known fromMexican caves (Holt, 1973). Cambarincola acudentatusHolt is of special interest in that it has been foundonly on the troglobitic cirolanid isopods Speocirolanapelaezi (Bolivar) and S. bolivari (Rioja) in Grutas deQuintero, Tamaulipas. The second species, C. susanaeHolt, is known from the crayfish Procambarus acutuscuevachicae (Hobbs) in Cueva Chica, San Luis Potosi.Table 8.-Summary of cave inhabiting Annelida.TroglobitesOther SpeciesClitellataBranchiobdellidaBranchiobdellidae 0 2HaplotaxidaHaplotaxinaTubificidae 0 1LumbricinaAcanthodrilidae 2 3Glossoscolecidae 0 1Lumbricidae 0 3Megascolecidae 0 2Ocnerodrilidae 0 1Octochaetidae 0 5HirudineaArhynchobdellaeErpobdellidae 0 1RhynchobdellaeGlossiphoniidae 0 2Ichthyobdellidae 0 1Piscicolidae 0 1Incertae SedisAelosomatidae 0 1Total 2 24Order HaplotaxidaSuborder HaplotaxinaFamily TubificidaeThe family Tubificidae is represented in Mexicancaves only by a record of Aulophorus sp. in Cueva deLos Sabinos, San Luis Potosi (Osorio Tafall, 1943).Numerous collections of small aquatic oligochaetesremain unstudied. Specimens from caves in the Sierrade Guatemala, Tamaulipas, and from Cueva de la Siquita,Durango, were found in unusual situations(drip pools and deep spring-fed pools) and in directassociation with aquatic troglobites. The extremetransparency of these specimens and the circumstancesin which they were found strongly indicatethat they are troglobitic.Suborder LumbricinaEarthworms are not uncommon in caves but arefrequently in very poor condition, indicating that75