OVUM IN THE CAPE AND NEW ZEALAND PERIPATUS. 13 
between the two sides of the ovary throughout their middle 
region is by means of the wall of the pericardium to which 
they are both attached. The yolk is coloured yellow. There 
are never any spermatozoa in the ovary, these being in the 
receptaculum seminis, which is present in this species. In all 
but a very few cases I have found the receptaculum tightly 
packed with spermatozoa. 
Ovarian Ova.—dAs in the other species the ova arise from 
the nuclei of the germinal epithelium. 
The youngest egg which I have observed was situated on the 
outer side of the germinal epithelium bordering on the body- 
cavity. The protoplasm, which was granular, formed a narrow 
band surrounding a nucleus which stained more deeply, and 
was coarsely granular. A nucleolus was present, placed almost 
centrally. 
The egg grows in size, both nucleus and cell-substance 
taking part in the process. The nucleus acquires a vacuolate 
structure, the substance between the vacuoles staining deeply 
and having a homogeneous appearance ; the nucleolus also has 
grown slightly. The egg projects from the ovary, being situa- 
ted at the end of a short stalk which is formed from some of 
the cells of the germinal epithelium. 
The egg continues to grow, and a further change takes place 
in the character of the nucleus, which consists in the aggregation 
of the deeply staining vacuolated tissue towards its periphery, 
thus leaving a small central area round the nucleolus. 
This aggregation progresses still farther and the tissue loses 
its reticular character and forms for the nucleus a solid widish 
wall, which is homogeneous and stains deeply. The centre of 
the nucleus does not stain, with the exception of an irregular 
faintly staining reticulum, and the nucleolus which is placed 
about in its centre. The nucleolus is round, stains very 
deeply, and contains some small vacuoles and a number of 
small round bodies which stain even more deeply and are very 
highly refractive. The egg-protoplasm at this stage is granular, 
and contains numerous verysmall yolk-globules, which resemble 
those which are present in the Cape species at a similar stage, 
