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TyphlilJs: Pearse, 1938a:13, 15; Hubbs, 1938:261,287-290; Walls, 1942:388;Osorio Tafall, 1946:156;Pearse, 1945:135, 214;Alvarez, 1950:109;Bolivar,1950:216; Cardenas Figueroa, 1950:157; Whitley,1950:67; Poll and Leleup, 1965:466.Typhlias pearsi: Osorio Tafall, 1943:68-69; Thines,1955:42, 82, 108-109; Thines, 1960:45, 50, 52,pI. 2; Tamayo, 1962:vol. III:261; Vandel, 1964:271, 300; Vandel, 1965a:230, 252; Greenwood,1967:264, fig. 56B; Delamare Deboutteville,1971:68 (erroneous spelling).Tiphlias pearsei: Carreno, 1950:24 (erroneous spelling).Typhliasina pearsei: Whitley, 1950:67; Solorzano,1953:286; Nicholas, 1962:185; Rioja, 1962:38;Alvarez, 1970: 150; Andrews, 1970:4; Reddell,1971b:84; Wilkens, 1973a:329-330, fig. 1; Wilkens,1973b:204, 205; Wilkens, 1973c:50, 54-55,56, 57,58, fig. 4; Reddell, 1977b:236, 239, 240,258,263,268,281,285.Typhliasina: Whitley, 1950:67; Rioja, 1962:39; Cohenand Robins, 1970:134, 135; Juberthie, 1974:8l.Blind brotula: Woods, 1954:4.Typhlia: Bertin, 1958a: 1919 (erroneous spelling).Blind Hohlenfische: Wilkens, 1960b:499.Blind brotulid of Mexico: Norman, 1963: 194_Yucatan Brotulidae: Norman, 1963:196.Typhliasina pearsi: Vandel, 1964:271; Vandel,1965a:230; Thines, 1969:29, 135,172-174,250,fig. 73-74; Delamare Deboutteville and Botosaneau,1970:75; Thines and Tercafs, 1972:63, 138,fig. 23 (erroneous spelling).Typhlyasina: Argano, 1972b:33 (erroneous spelling).Typhliasina pearcei: Wilkens, 1973b:204 (erroneousspelling).Type-Iocality.-Balaam Canche Cave (=Grutas deBalankanche), near Chichen Itza, Yucatan, Mexico.Distribution.-Known only from five caves in Yucatan.See Fig. 85.Records.-Yucatan: Gru tas de Balankanche, Cenotede Calchuhuim, Cenote de Hoctun, Cenote delPochote, and Grutas de Tzab-Nah.Discussion.-Typhliasina pearsei is eyeless and depigmented.It was collected from a deep lake in theinner passage in Grutas de Tzab-Nah and from shallowpools connected to the groundwater in the othercaves. Wilkens (1973a, 1973b) contends that this speciesis a very old troglobite, based at least in part onthe degree of reduction of the eyes. Chitwood (1938)has reported the presence of the nematode Rhabdochonakidderi Pearse in the intestine of this species_Four other freshwater brotulids, all troglobites, areknown: Caecogilbia galapagosensis Poll and Leleupfrom deep crevices on Isla de Santa Cruz, GalapagosIslands; Lucifuga (5tygicola) dentatus (Poey) and1. (Lucifuga) subterraneus Poey from Cuba; and1. (5.) spelaeotes Cohen and Robins from '\lew Providence,Bahamas. Cohen and Robins (1970) believethat l'yphliasina is more closely related to the marinegenera Dinematichthys and Ogilbia than to Lucifuga.Vandel (1964) speculates that the troglohitic Lrotulidshave been derived from marine littoral specieswhich inhabited cavities in coral reefs.Family CichlidaeTwo species of cichlids, Cichlasoma meeki (Brind)and C. urophthalmus (Gunther), have been reportedfrom the subterranean waters of Yucatan (HubLs,1936, 1(38). Cichlasoma meeki is known only froman artificial cenote and is probably a species introducedby man. Cichlasoma urophthalmus containsfour subspecies associated with caves and cenotes:C. u. conchitae Hubbs, C. u. ericymba Hubbs, C. u.mayorum Hubbs, and C. u. zebra Hubbs. The onlyone of thesc which seems to be dosely associatedwith the cave habitat is C. u. ericymba, which isknown only from Cenote de Sambula (Merida).Cichlasoma cyanoguttatum (Baird and Girard) hasbeen collected in Cueva del Carrizal, Nuevo Leon.Order SynbranchiformesFamily SynbranchidaeOphisternon infernale (Hubbs)Pluto infernalis Hubbs, 1938:261, 263, 265, 269,270,292-293, pI. 4; De Buen, 1940:6; Osorio Tafall,1943:68-69; Anonymous, 1947:128; Pearse,1945:112,114,208; Alvarez, 1950:15, 23;CardenasFigueroa, 1950:156, fig. 4; Carreno, 1950:24;Robles Ramos, 1950:64; Ladiges, 1951b:168;rhines, 1955:41, 71,108-109; Dearolf, 1956:203;Barrera, 1962:84; Mees, 1962:27,28,31,32; Tamayo,1962:vol. III:261, 320; Vandel, 1964:266;Vandel, 1965a:226; Andrews, 1970:4; DelamareDeboutteville and Botosaneau, 1970:75.Pluto: Hubbs, 1938:261, 291-292; Osorio Tafall,1946:156; Pearse, 1945:111, 135, 207; Alvarez,1950:23; Bolivar, 1950:216; Whitley, 1950:67;Bertin, 1958b:2661; Vandel, 1964:272; Vandel,1965a:231.Furmastix infernalis: Whitley, 1950:67; Nicholas,1962:184; Vandel, 1964:266; Vandel, 1965a:226;Alvarez, 1970:130; de Lachica 8., 1970:65, 122;Herald, 1972: 139; Parzefall and Wilkens, 1972:63­79, fig. 2-3, 4h, 5b; Rosen and Rumney, 1972:1,246