Abstract
The covering layer of Gyrocotyle, which is thought to occupy an intermediate position between the monogeneans and the cestodes, resembles that of the cestodes more than the epidermis of the ectoparasitic monogeneans. It is a cytoplasmic epidermis bearing densely arranged microvilli and is connected to parenchymally situated cell bodies. The microvilli of Gyrocotyle differ from the microtriches of tapeworms in lacking a thickened tip. Vesicles between the microvilli at the free edge of the epidermis are associated with disintegrating striated rod-bodies and are therefore probably secretory rather than concerned with micropinocytosis. The epidermal cell bodies have the characteristics of secretory cells and appear to elaborate the striated rod-bodies which occur throughout the outer epidermis and may consist of condensed mucoprotein. Cells with electron opaque cytoplasm which occur in the neighbourhood of the epidermal cell bodies have been identified as myoblasts. The posterior rosette appears to be specialized for adhesion as gland cells secreting PAS positive material line the ventral rosette surface and the epidermis of this region bears short bifurcate microvilli.
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