a1 Department of Pure and Applied Zoology, Agrlcultural Sciences Building, University of Leeds, Leeds, England
By means of scanning electron microscopy, stalked protrusions were observed arising from the outer surface of intact brood capsules of Echinococcus granulosus. Histological studies showed these protrusions to be developing protoscoleces. However, complete development is not attained and the protoscoleces eventually die. It is suggested that external development is a result of overcrowding within the brood capsule.
* Present address: School of Veterinary Studies, Murdoch University, Murdoch, Western Australia, 6153