Abstract
1. Mehlis's gland secretion in trematodes and pseudophyllidean cestodes may be a lecithin-like phospholipid.2. After enzymic degradation of the lecithin into lysolecithin the release of egg-shell precursors from the vitelline cells is effected.3. Soon after the completion of the egg-shell the lysolecithin may be reconverted into lecithin in vitelline cells of Penetrocephalus ganapatii, thus accounting for the periodic acid-Schiff positive reaction.
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