Further Studies on the Development ofCysticercus fasciolarisandCysticercus pisiformis, with special reference to the Growth and Sclerotization of the Rostellar Hooks

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Abstract
The previous observations of the author and others on the development otCysticercus fasciolarisandC. pisiformishave been confirmed and amplified by experimental studies, and the developmental processes of the two forms are compared. While definite information has been obtained on the age of the various developmental stages, there is considerable variation due to the subtleties of the host-parasite relationship.The study of the development of the rostellar hooks of taeniids has been extended by the use of differential staining, histochemical tests and polarized light, and new facts, such as the chemical and optical differences existing between cuticle and hooklets and between blade and base of hooks, have been brought to light.