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Creaseria morleyi (Creaser)Blind shrimps (part): Pearse, 1933: 110.Palaemon morleyi Creaser, 1936:126-128, 131, fig.25-30; Pearse, 1936c:24; Creaser, 1938:163-164;Chace, 1943:31,33; Pearse, 1945:169, fig. 25-30;Anonymous, 1947:128; Cardenas Figueroa, 1950:156; Carreno, 1950:24; Villalobos, 1951:215;Rioja, 1953a:29:3, 294; Balss, 1955:1:Hl; Holthuis,1955:44; Hobbs and Hobbs, 1976:1; Hobbset aI., 1977:7,9; Hobbs, 1979:618.Palaemon: Pearse, 1938a: 13, 15; Pearse, 1945:111,167; Cardenas Figueroa, 1950:157.Creaseria morleyi: Holthuis, 1950:6 (by implication);Holthuis, 1952:153-154, 356-357, pI. 40; Chace,1954:323; Holthuis, 1955:44 (by implication),fig. 22a; Holthuis, 1956:56-57; i\laccagno and Cucchiari,1957:207 (by implication); Nicholas, 1962:174; Rioja, 1962:38,40; Vandel, 1965:179; Rodriguezde la Cruz, 1965:76, 97-98, pI. 4(fig. A);Vandel, 1965a:140; Andrews, 1970:4; Reddell,1971b:25; Rioja, 1971:522; Parzefall and Wilkens,1972:66; Wilkens, 1973a:327, 328, 330, fig. 3;Wilkens, 1973b:205; Wilkens, 1973c:50-54, 56,58, 59, fig. 1-3; Burukovskii, 1974:fig. 96a; Holthuis,1974:141; Hobbs and Hobbs, 1976:1, 16­19, 20, 21, fig. 7-8; Strenth, 1976:13; Hobbs etal., 1977:6,9, 12,25,46-50, fig. 18-19; Holthuis,1977:186-187, fig. 5; Reddell, 1977b:230, 240,241,243,247,251,252,253,255,258,262,263,264,266,267-268,273,274,277,281,283,285,291, 292, 293; Hobbs, 1979:618,619,621,624,625,627-632, fig. 1, 4B-C.Creaseria: Holthuis, 1952:2, 152-153; Holthuis,1956:69; Balss, 1957:1549; Delamare Deboutteville,1960:646; Argano, 1972b:33; Chace, 1972:17; Hobbs et aI., 1977:5, 14, 16,46.Palaemon morley: Rioja, 1953a:286 (erroneous spelling).Creaseria morlayi: Delamare Deboutteville, 1960:648(erroneous spelling).?Shrimp: Lee, 1966:88.Creaseria morelyi: Hobbs and Hobbs, 1976:1 (erroneousspelling).Type-locality.-San Isidro Cave (=Cueva de San Isidro),Salar Colony, Yucatan, Mexico.Distribution.-Known from many caves in Campeche,Quintana Roo, and Yucatan. See Fig. 15.Records.-Campeche: Cenote Bolchen, Grutas deMonte Bravo, and Grutas de San Antonio; QuintanaRoo: Cueva Coop, Cueva del Fermin, Cenote de JuanCoh, Cenote de Las Ruinas, Pozo de San Martin, Cenotede Santo Domingo, and Cenote de Tos Virlol;Yucatan: Cenote de las Abejas, Cueva Amil, Grutasde Balankanche, Cenote Calchuhuim, ActUn Chac,Cueva Chac Mol, Cenote de la Culebra, ActUn Gongora,Cenote de HoctUn, Cenote Kabahchen, Cenotede la Paca, Cenote del Pochote, Cenote de Sambula(Motul), Cueva de San Isidro, Pozo de Santa Elena,Cueva de Sodzil, Grutas de Tzab-Nah, ?Cueva Xconsacab,Cenote X-ebiz, ActUn Xpukil, and CenoteYunchen.Discussion.-This large, distinctive species is anever-present element of the fauna of pools and lakesin caves in the Yucatan Peninsula. It is frequentlyfound in large numbers, especially crawling about thefloors of pools over which bats roost. Many individualsare seen which have lost one cheliped, presumablyin fights with other members of the same species.Wilkens (1973c) in a study of the structure of the eyeremnants in this species reports that the eye stalkconsists only of medulla interna and medulla terminalis.The record for Cueva Xconsacab was a sightrecord only and should be verified by specimens.iHacrobrachium acherontium HolthuisMacrobrachium acherontium Holthuis, 1977:174,188-193,194, fig. 6-7.Macrobrachium new species: Hobbs et al., 1977:5.Type-locality.-Grutas del Cocona, 3 km NE ofTeapa, Tabasco, Mexico.Distribution.-Known only from two caves nearTeapa, Tabasco. See Fig. 15.Records.-Tabasco: Grutas del Cocona and Resumiderodel Cocona.Discussion.-This species is most closely relatedto M. villalobosi. The cornea is very reduced and theanimals are transparent brownish. This species ispresumably a rather recent troglobite. In Grutas delCocona it primarily inhabits a large, shallow pond.The animals usually rest quietly or walk slowly abouton the silt floor. In addition to the two troglobitesdiscussed here, two other species are known fromcaves in Mexico and Guatemala. The river prawn,IvI. carcinus (Linnaeus), has been collected in CuevaChica, San Luis Potosi, and Cueva del Saito de Agua,Chiapas. In hath instances this species has enteredfrom rivers directly associated with the caves. Macrobrachiumacanthurus (Wiegmann) has heen collectedin Cueva de la Coche, Izahal, Guatemala, and inCueva de Abispa, Quintana Roo, Mexico.Macrobrachium villalobosi HobbsMacrobrachium villalobosi Hobbs, 1973b:77, 79-80,fig. 3; Strenth, 1976:1:3; Hobbs et al., 1977:6,8,11, 12, 16, 22, 23, 25, 50-52, 67, 118, fig. 20;Holthuis, 1977:188, 192-193.109