The Exogoneæ.

Abstract

The following are the most important of the results embodied in this paper:— Descriptious aid determinations of Australian species of Exogoneæ Demonstration of the rôle of the pedal glands in producing the secretion by means of which the ova are attached after extrusion. Description of the proventriculus with its non‐striated muscle‐colnmns, and of hitherto undescribed glands—the proventricular glands— the ducts of which open into it. The following out of the changes undergone in Exogone by the nephridia in both sexes associated with the development of the sexual elements. The hermaphrodite condition in Grubea pusilloides. Description of stages of the development not previously investigated Copyright © 1920, Wiley Blackwell. All rights reserved