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AMCS Bulletin 5 ReprintFigs. 33-38. Spelaeomysis cardisomae (3561. 33. Maxilliped, proximal part. 34. Male pereopod 1 endopod. 35. Male pereopod7 endopod. 36. Male pleopod 2. 37. Male pleopod 3. 38. Male uropod, ventral.the oral region more heavily pigmented.Relationships-S. servatus (Fage), the only otherspecies with ommatidia, is also most similar to S.cardisomae in other characters. The 2 species can bedistinguished readily by the armature of the apex ofthe telson. In S. servatus the pattern of the apicalspines is similar to that of S. cardisomae, but thespines are relatively shorter (Fig. 32).Distribution-The occurrence of S. cardisomae inboth Atlantic and Pacific localities is rather surprising,but I have not found any c1earcut differences betweenspecimens of the 2 populations. The specimens fromthe Columbian islands were in poor condition, and itwas not possible to compare them fully with thePeruvian specimens. When adequate material becomesavailable, such a study should be made. If the occurrenceof S. cardisomae in Cardisoma burrows is notfortuitous, it is possible that its range will be found tocoincide with those of the crabs. C. guanhumi occursin Bermuda, Andros Island (Bahamas), the centraleast coast of Florida, Louisiana, and Texas south toFlorianapolis, Brazil, including the West Indies (Chaceand Hobbs, 1969; Bright and Hogue, 1972). The geminatespecies C. crassum, is known from Todos Santos,Baja California, to the RIo Chira, Peru (Bright andHogue, 1972).Remarks-The presence of ommatidia in S. servatusand S. cardisomae is related to their occurrence inhabitats where light is not completely excluded as itis in the caves occupied by other species of Spelaeomysisexcept S. longipes. The latter inhabits subterraneanwaters in southern India and was collectedfrom a well nearly 15 min depth penetrating tothese waters (Pillai and Mariamma, 1964). An analogoussituation is found in the genus Antromysis. A.cenotensis, which lives in caves in Yucat~n, M~xico,has medially fused eyestalks without visual elements,whereas A. anophelinae, which lives. in the burrowsof Cardisoma guanhumi in Costa Rica, has a narrowband of ommatidia (Tattersall, 1951).LITERATURE CITEDBacescu, Mihai, and Traian Orghidan. 1971. Antromysiscubanica n.sp. et Spelaeomysis nuniezi n.sp., mysis cavernicolesnouvelles de Cuba. Rev. Roumaine BioI., ser.Zool.,16(4):225-231.Bright, Donald B., and Charles L. Hogue. 1972. A synopsisof the burrowing land crabs of the world and list of theirarthropod symbionts and burrow associates. Contrib. Sci.Los Angeles Co. Nat. Hist. Mus., 220: 1-58.Caroli, E. 1924. Su di un Misidaceo Cavernicolo fSpelaeomysisbottazzii n.g., n.sp.l di Terra d'Otranto. Atti Accad.19