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any way a part of the true cave fauna and are notfurther discussed here (see Table 7). Zullini (1974)has, however, produced an excellent paper on theNematoda of the soil and water of Chiapas and adjacentGuatemala. His report includes records of sevenaquatic and seven soil species of nematodes fromcaves in Chiapas and Guatemala. A second study ofthe aquatic nematode fauna of southern Mexico includednumerous records of species from wells, cenotes,and caves (Zullini, 1977).Class AdenophoreaOrder AraeolaimidaFamily PlectidaePlectus cirratus Bastian was found in the mudfrom the floor of pools in Cueva del Panteon andGrutas del Rancho Nuevo, Chiapas. This widespreadspecies was also found in stream sediment near Huistin,Chiapas (Zullini, 1974).Order MonhysteridaFamily MonhysteridaeMonhystera paludicow de Man was collected fromthe bottom of the stream in Cueva Chorreadero, Chiapas.It was also found in surface streams (Zullini,1974).Order ChromadoridaFamily CyatholaimidaeProdesmodora circuwta (Micoletzky) was foundonly in the mud of Cueva Chorreadero, Chiapas (Zullini,1974).Order EnoplidaFamily AlaimidaeAlaimus primitivus de l\'lan, a common species inEurope and America, was collected from mold inCueva Chorreadero, Chiapas (Zullini, 1974). An undeterminedspecies of Amphidelus was found indamp, guano-rich mud in Grutas de Zapaluta, Chiapas(Zullini, 1977).Family AxonchiidaeAxonchium sbordonii Zullini was described fromslime in Sima del Ojito, Chiapas (Zullini, 1974); it isknown only from this cave.Family IronidaeIronus ignavus Bastian was collected from water inCueva Chorreadero, Chiapas (Zullini, 1974), and fromwater and bottom mud in a cenote at Yokdzonot,Yucatan (Zullini, 1977). Ironus longicaudatus de Manwas found in slime in Sima del Ojito, Chiapas (Zullini,1974), and in water and bottom sediment in CenoteXtojil, Yucatan (Zullirri, 1977).Family LongidoridaeXiphinema index Thorne and Allen was reportedby Zullini (1974) from mud in Cueva del Tepesquintle,Huehuetenango, Guatemala, and from SimaTable 7.-Summary of cave inhabiting Nematoda.TroglobitesOther SpeciesAdenophoreaAraeolaimidaPlectidae 0 1MonhysteridaMonhysteridae 0 1ChromadoridaCyatholaimidae 0 1EnoplidaAlaimidae 0 2Axonchiidae 0 1Ironidae 0 2Longidoridae 0 2Mononchidae 0 5Tripylidae 0 3DorylaimidaDorylaimidae 0 6SecementeaAscarididaAscaridiidae 0 1Heterocheilidae 0 2FilariideaDipetalonematidae 0 1Filariidae 0 1OxyurideaCruziidae 0 1axyuridae 0 3SpiruridaRhabdochonidae 0 1Rictulariidae 0 1Seuratidae 0 1StrongylidaTrichostrongylidae 0 6TrichurideaTrichuridae 0 2TylenchidaTylenchidae 0 1Total 0 45del Ojito, Chiapas. This is a common species in Europe,America, and Africa. Zullini (1977) reportedX. basiri Siddiqi from wells in Merida and Teya, Yucatan.Family MononchidaeMononchus longicaudatus Cobb was reported frommud in Cueva del Panteon, Chiapas (Zullini, 1974); it74