| The epithelium of the anterior tip of the bodywall, of the proboscis cavity and of the proboscis cone in <i>Polycystis naegelii</i> has been studied with the electron microscope. These epithelia are formed by six syncytial belts separated from each other by cellular limits: one belt belongs to the epidermis, three line the cavity and two cover the cone. The posterior belt of the cavity and those of the cone are of the insunk type bringing about a peculiar relationship between the latter two. Moreover, they are associated with muscular elements under the basal cone belt but above its basement membrane. Nine different kinds of glands have been observed erupting at the surface of the epithelia in the studied area, while six different sorts of... |
