Acta Zoologica Academiae Scientiarum Hungaricae

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Aeta MoIogica Academiae Scientiarum Hungaricae 22, I976

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Acta Mologica Academiae Scientiarum mngaricae 22, 1976

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which lacks a distinet nucleolus ti ut possesses a s mali number of chromatin

Bene ath the epidermat celis, there are in toto mounts) a great number Of nuclei lacking a nucleolus hiat possessing a number of Sc attered chromatin granules Fig8. I 5, 9, II 3. Among them there are twO type8 Os nuclei; One type has spherical nuclei 5 - 6 ιι or 3 - 5 si, respectively, in diameter vhile the nuclei of the Seconii type are Oval in Shape, meas uring 6 3 si Fig. 153. These nuclei helong mainly to the sub epithelial and the muscle celis and they do not Slio vany regular arrangement. Nuclei ure found in greater number in the anterior

The coarSely granular apicat gland is voluminous and me asiares 55 - 85 si

Acta Mologica Academiae Scientiarum Hungaricae 22, 2976

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In the posterior half of the hody of the miracidium, there is a redia in both species in the germinal cavlty where it is suspended by elastic sitires Figs. I 2, 9, 10, ΙΙ). The shape of the redia in the miracidium is elongate dFigs. 12 - 15. Internat anatomy of miracidia and redia, 12 miracidium os Basidiodiscus ectorchis, laterat View, showing internat structures; 13 - frontal vlew of miracidium after silver nitrate treating: 14 dissected redia of Sandonia sudanensis with internat structures; 15 - nuclei os miracidium os Sandonia sudanensis stained in haematoxylin

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dissection Dom the miracidium, iis b Ody hec Omes gradu atly OVal, then Spherical, with a stight contraction and relaxation Observatile. Os the Organs, especialty in case of a liberaled redia, the orat Sucker is eas ity Seen, meas uring 25 si in diameter Fig. 143. It continues into a Shori Oe Sophagus with a minute bulbus at iis en d and then follows a single digestive iube Fig. 143. There are twopairs of flame celis, One Bair Symmetricalty in the anterior and the Other One in the posterior end of the redi a Fig. 14). The two anterior flame celis Openinio an excretory duci ea ch, Which bifurcate biit they join later again. Ducis of the flame celis on ei ther fide empty into a lateralty localed eXcretory pore

The pre Sence of a redia in the germinal cavlty of the miracidia is one ostheir most characteristic se atures. 4 Similar phenomenon can be soliud in certa in species of tho families Cycloco elidae and Philophtalmidae GINΕΤSINSKAYΛ, 19683. Λmong amphistomes, a Similar picture was described in the species Stichorchis subtriquetrus Η ΕΝΝΕΤΤ et ut . I939; ORI OV, 19483. At the present time, it se enis dissiculi to give a retiatile eX planation Of the phylo geneticalandior ecological importance of thi S Phen Omena. REFERE CES

231. 3. DUTT, S. C. and SRIVASTAVA, H. D. I9 23: The Lila History of Gastro discoides hominis Lewis et IIcConnet, 1826ὶ Leiper. 191 3 the Λmphisto me Parasite Os Maii and Pig. J. Helmithoi., 45r 35 - 46.4. FISCHTHAL, J. H. and ΚUNTE, R. E. I959ὶ: Tremato de parasites of fishes froni Egypt.

Acta Mologica Academiae Seientiarum Hungarieae 22, 1976

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The paper contains further data ori species of the genus Euryloma ILL., Ι 80T, collected in Μongotia, the description of a new species, and a key based On females and males of the Palaearctic Species.

ERD., 1969, with E. collaris WALΚ., 1832. Or we must face it that the apparentlymost retiatile morphological seatures and di agnostio characters are impraeticalones and that a large bulk of a collection taken by Sweeping re mainS undeterminatile. Till now Ι had no opportunity to examine CLΛΗΙDGE 'S typeS Or authentie specimens of the species described by him. I belleve that they represent good

Acta ZOOIoglea Academiae Scientiarum Hungaricae 22, I976

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species, but jud ging by his descriptions and figures they sor instance his E.

Acta MoIogica Academiae Scientiarum Hungarieae 22, 1976

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for E. centaureae CLAR.