DEVELOPMENT OF THE CAPE SPECIES OF PERIPATUS. 209 
however, lie in the same transverse plane as the female nucleus, though very 
nearly so. It is formed of anetwork, precisely similar in character to the 
extra-nuclear reticulum. The membrane round the nucleus is continuous 
with both the extra- and intra-nuclear reticulum. Deeply-staining bodies 
are present in the intra-nuclear parts of the network. Near the female 
pronucleus is the second polar body, with a small portion of the first attached 
to it. Greatest diameter of female nucleus ‘029 mm. ‘The male nucleus 
measured *025 x ‘016 mm. Drawn with Zeiss’s camera, F, oc. 2. Picric 
acid. f. 2. Female pronucleus. m. ». Male pronucleus. oc. Cavity in 
ceutre of ovum. op. %.,. First polar body. p. 4... Second polar body. s, 4. 
More deeply-staining bodies in extra-nuclear part of ovum. 
Fig. 2.—Nucleus of unsegmented ovum of Peripatus capensis in 
spherical stage. Network more diffusely stained than in Fig. 8. Borax car- 
mine. Drawn to same scale as Fig. 8. 
Fie. 3.—Nucleus of an ovum with two segments of Peripatus capensis. 
Nucleus divided up into compartments by specially well-marked portions of 
the nuclear network. The deeply-staining irregularly-shaped masses are 
almost certainly contained in the strand of the network. The nuclear net- 
work is most distinctly continuous with the extra-nuclear reticulum. Reticu- 
lum, both of nucleus and cell-substance, slightly stained. Greatest diameter 
‘03 mm. Borax carmine, sublimate and acetic. Zeiss’s F, oc. 2, camera. 
Fic. 4.—Three nuclei from endoderm of embryo of Peripatus capensis 
of stage of Pt. 1, Pl. XXXI, fig. 19. Zeiss’s F, oc. 2, camera. 
Fig. 5.—Nucleus of endoderm cell, lying in the gut of an embryo of the 
same stage. Zeiss’s F, oc. 2, camera. 
Fie. 6.—Two endoderm masses of Peripatus capensis, with their con- 
nections and processes. Surface view of sublimate preparation as seen with 
Zeiss’s >,th oil imm., oc. 2. Sublimate and acetic. 
Fie. 7.—Surface view of a portion of the reticulum connecting the endo- 
derm masses and ectoderm of a fully segmented ovum of Peripatus 
capensis, as seen with a Zeiss’s th oil imm. No endoderm masses shown. 
Sublimate preparation. Strongly refractile bodies in the strands of the net- 
work and sometimes in the meshes. 
Fie. 8.—Transverse section through the fertilised ovum of Peripatus 
capensis, showing the nucleus in the spherical stage. The protoplasmic 
network around the nucleus is denser than elsewhere. A well-marked cavity 
jn the centre of the ovum. Nuelear network for the most part unstained. 
Nuclear membrane and extra-nuclear reticulum stained. Diameter of nucleus 
‘04mm. Borax carmine, picric acid. 
Fic. 9.—Portion of edge of ectoderm of Peripatus capensis, with 
adjacent endoderm masses showing connection between the two. Surface 
view of sublimate preparation, as seen with Zeiss’s c, oc. 2. 
