210 ADAM SEDGWICK. 
Fic. 10.—Ideal diagrammatic transverse section through the fully segmented 
ovum of Peripatus capensis, at about the stage figured in Pl. XXXI, fig. 
8, this Journal, vol. xxv. ec. Hctoderm. em. Endoderm masses, connected 
by reticulum. e.s. Egg-shell. 
Fie. 11.—Transverse section through an ovum of Peripatus capensis 
with two segments. The section passes through the centre of the nucleus of 
one segment. ‘The nucleus has the spindle form, which immediately precedes 
division. The figure shows clearly the continuity and the similarity between 
the fibres of the spindle and the fibres of the extra-nuclear reticulum. A 
well-marked cavity is present in each segment. Greatest diameter of spindle 
‘06 mm. Drawn with Zeiss’s F, oc. 2, camera. Sublimate and acetic. 
Fie. 12.—Portion of edge of ectoderm of ovum of Peripatus capensis, 
almost at the close of segmentation, as seen with a Zeiss’s water imm. 2, 
Sublimate preparation. The connection between the ectoderm cells is clearly 
shown, also between the ectoderm cells and the network connecting the 
endoderm masses. Nucleus of ectoderm indicated. x. Network. The 
apparent granulation of the ectoderm is caused by the fineness of the reticulum. 
Fic. 13.—View of endoderm mass of an ovum of Peripatus Balfouri, 
as seen with a Zeiss’s water imm. 2, to show the spongework of which the 
mass is composed. 
Fic. 14.—Transverse section through an ovum of Peripatus capensis 
with eight ectoderm cells, to show the greater density of the network round 
the nucleus than at the periphery, where it is continued into the reticulum of 
the next cell. Hndodermal masses not indicated. Zeiss’s D, oc. 2, camera. 
Diagrammatic. 
Fie. 15.—Transverse section through an ovum of Peripatus capensis 
with about sixteen ectoderm cells, somewhat diagrammatic. The endoderm is 
indicated. The section shows that the ovum is of the nature of a hollow 
blastosphere. Zeiss’s D, oc. 2, camera. 
¥ic. 16.—Section through an embryo of Peripatus capensis at the 
stage of Pt. 1, Pl. XXXI, fig. 11. The endoderm masses contain a central 
denser protoplasm, and a number of darkly-staining granules. No nuclei 
visible in endoderm. Zeiss’s D, oc. 2, camera. 
Fic. 17.—Transverse section through the uterus, and contained a fully 
segmented ovum of Peripatus capensis (blastosphere stage). Zeiss’s c, 
oc. 2, camera. ec. Hctoderm. ez. Hndoderm. uw. e. Uterine epithelium. 
e. s. Hgg-shell. 
Fic. 18.—Slightly oblique section through an embryo of Peripatus 
capensis of the stage of Pt. 1, Pl. XXXI, fig. 15. Zeiss’s c, oc. 2, 
camera. 
Fic. 19.—Portion of ovum of Peripatus Balfouri with eight ectoderm 
cells, showing one of the corner ectoderm cells connected by a reticulum 
