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A description is given of the external features of the scolex and strobila and the anatomy of the proglottid ofAcanthobothrium pearsonisp.nov. found in the intestine ofOrectolobus maculatusBon. In view of the similarity in host distribution and anatomy to that ofBiporophyllaeus madrassensisSubramanian some comments are made on the status of the order Biporophyllaeidea and it is suggested thatB. madrassensismay be a proglottid of a species ofAcanthobothrium.
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H. Harford Williams (1962) studied this question.
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