Head Organs and Cephalic Glands of Cleidodiscus mirabilis

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Abstract
Specimens of the monogenetic trematode, C. mirabilis. were obtained from the gills of the yellow and blue catfish, Live and fixed material was examined and a detailed study of the head organs and cephalic glands was made. Fixation in Zenker-formol and Carnoy''s was used for sectioned and whole material, respectively. Live specimens were mounted in water. Examination of all living material was made with the aid of the phase-contrast microscope and results were corroborated by study of fixed and sectioned material. Head organs were found to consist of 4-6 pairs of ducts opening to the antero-lateral margins of the prohaptor. The head organs are connected to syncytial masses forming the cephalic glands which in turn are lobate in outline and are situated near the pharynx. The cephalic glands produce a mucoid secretion of rhabdite nature which appears to aid in the attachment of the prohaptors during feeding and locomotion.

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