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SEY, O. (1973): Histological characterization of the pharynx, genital atrium and acetabulum of Nematophila grande (Diesing, 1839) (Trematoda, Paramphistomata). - Parasit, hung. 6: 63-67. SEY, O. (1975): Histological examination on the muscular organs of some amphistomes (Trematoda: Paramphistomata). - Parasit, hung., 8: 55-59. SEY, O. (1980a): Re-examination of an amphistome (Trematoda).collection deposited in the Geneva Museum with a description of Orthocoelium saccocoelium sp.n.- Revue suisse Zool., 87: 431-437. SEY, O. (1980b): Amphistome parasites of the dugong and a revision of the subfamily Solenorchiinae (Trematoda: Paramphistomatidae). - Acta zool. hung., 26: 223-228. SEY, O. (1983): Revision of the family Gastrothylacidae Stiles et Goldberger, 1910 (Trematoda, Paramphistomata). - Acta zool. hung., 29: 223-252. SEY, O. (1984): Description of Watsonius papillatus sp.n. and the revision of the subfamily Watsoniinae Nasmark, 1937 (Trematoda, Paramphistomata). - Acta zool. hung., 30: 493-510. SEY, O. (1985): Amphistomes of Vietnamese vertebrates (Trematoda, Amphistomida). Parasit, hung., 18: 17-24. SEY, O. - GRABER, M. (1979): Cotylophoron macrosphinctris sp.n. (Trematoda: Paramphistomata) from the African buffalo, Bubalus (Syncerus) caffer Sparrman. - Annls Parasit, hum. comp., 54: 279-302. SEY, O. - GRABER, M. (1979b): Examination of amphistomes (Trematoda: Paramphistomata) of some African mammals. - Rev. Elev. Méd. vét. Pays trop., 32: 161- 167. SEY, O. - GRABER, M. (1980): Nilocotyle duplicisphinctris sp. n. (Trematoda: Paramphistomidae) from Hippopotamus amphibius. - J. Helminth., jj4: 123- 127. STILES, C.W. - GOLDBERGER, J. (1910): A study of the anatomy of Watsonius (n.g)watsoni of man, and of nineteen allied species of mammalian trematode worms of the superfamily Paramphistomoidea. - Bull. hyg. Lab. U.S. Pub. Health and Mar.-Hosp. Serv., 60: 1-259. TANDON, R.S. (1970): The amphibian genus of amphistomes, Pseudochiorchis Yamaguti, 19 58, recovered from chelonians at Lucknow, and its synonymity with the genus Kachugotrema Dwivedi, 1967. - Folia paras it. (Praha), 17: 293-297. WILLMOTT, S.M. - PESTER, F.R.N. (1961): A study of the Gastrodiscinae Monticelli, 1892 (Gastrodiscidae

: Paramphistomoidea). - J. Helminth., R.T. Leiper Suppl. XXXV: 205216. YAMAGUTI, S. (1971): Synopsis of Digenetic Trematodes of Vertebrates

. - Tokyo, Japan: Keikagu Publishing Co., vols. I and II, 1074 pp., 349 plates. Received: 2 October, 1987. Dr. SEY, O. Department of Zoology Janus Pannonnius University H-7604 Pécs, Ifjúság utja 6. HUNGARY