Fig. 26. Portion of ventral cord of _Peripatus capensis_ enlarged, shewing
two ganglionic enlargements and the origin of the nerves and commissures.
(From a drawing by Miss Balfour.)
_co._ Commissures. E._n._ Nerves passing out from ventral cords. F._n._
Nerves to feet. _g.co._ Commissures between the ventral cords containing
ganglion cells. _v.g._ Ganglionic enlargements.
Fig. 27. Segmental organ from the 5th pair of legs of _Peripatus capensis_.
This nephridium resembles those of the 4th legs, and differs from all the
others in its large size and in the absence of any dilatation giving rise
to a collecting vesicle on its external portion (enlarged). The terminal
portion has the same histological characters as in the case of the hinder
segmental organs. (From a drawing by Miss Balfour.)
Fig. 28. Segmental organ or nephridium from the 9th pair of legs of
_Peripatus capensis_, shewing the external opening, the vesicle, the coiled
portion and the terminal portion with internal opening (enlarged). (From a
drawing by Miss Balfour.)
_o.s._ External opening of segmental organ. _p.f._ Internal opening of
nephridium into the body-cavity (lateral compartment). _s._ Vesicle of
segmental organ. _s_{1}. Portion of segmental organ of 4th and 5th legs,
corresponding to vesicle of the other nephridia. _s.c._1. First or external
portion of coiled tube of nephridium, lined by columnar epithelium with
small nuclei; the cells project for very different distances, giving the
inner boundary of this region a ragged appearance. _s.c._2. Region No. 2 of
coiled tube of nephridium, lined by small closely-packed columnar cells.
_s.c._3. Region No. 3 of coiled tube of segmental organ, lined by large
flat cells with large disc-shaped nuclei. _s.c._4. Region No. 4 of coiled
tube of nephridium; this region is very short and lined by small columnar
cells. _s.o.t._ Terminal portion of nephridium.
Fig. 29. "Portion of nephridium of the hindermost leg of _Peripatus
capensis_, seen in longitudinal and vertical section. The figure is given
to shew the peritoneal funnel of the nephridium. Portions of the collecting
sack (_s._) and other parts are also represented. (Zeiss B, Hartnack's
camera.)"
_p.f._ Peritoneal funnel. _s._ Vesicle. _s.c.1_, _s.c.2_, _s.c.3._ Portions
of coiled tube.
Fig. 30. "Section through a tracheal pit and diverging bundles of tracheal
tubes" taken transversely to the long axis of the body. (Zeiss E, oc. 2.)
(From a rough drawing by Prof. Balfour.)
_tr._ _Tracheæ_, shewing rudimentary spiral fibre. _tr.c._ Cells resembling
those lining the tracheal pits, which occur at intervals along the course
of the tracheæ. _tr.s._ Tracheal stigma. _tr.p._ Tracheal pit.
Fig. 31. "Sense organs and nerves attached from antenna of _Peripatus
capensis_ (Zeiss, immersion 2, oc. 2.)" (From a rough drawing by Prof.
Balfour.) The figure shews the arrangement of the epidermis cells round the
base of the spine. The spine is seen to be continuous with the inner layer
of the cuticle.
Fig. 32. Section through the skin of _Peripatus capensis_; it shews the
secondary papillæ covered with minute spinous tubercles and the relation of
the epidermis to them. (The cuticle in the process of cutting has been torn
away from the subjacent cells.) The cells of the epidermis are provided
with large oval nuclei, and there is a deposit of pigment in the outer ends
of the cells. The granules in the protoplasm of the inner ends of the cells
are arranged in lines, so as to give a streaked appearance. (Zeiss E, oc.
2.) (From a rough drawing by Prof. Balfour.)
_c._ Dermis. _cu._ Cuticle. _ep.c._ Epidermis cells. _pi._ Deposit of
pigment in outer ends of epidermis cells. _s.p._ Secondary papillæ.
Fig. 33. Female generative organs of _Peripatus capensis_, × 5. (From a
rough drawing by Prof. Balfour.) The following note was appended to this
drawing: "Ovary rather to dorsal side, lying in a central compartment of
body-cavity and attached to one of the longitudinal septa, dividing this
from the lateral compartment between the penultimate pair of legs and that
next in front. The oviducts cross before opening to the exterior, the right
oviduct passing under the rectum and the left over it. They meet by opening
into a common vestibule, which in its turn opens below the anus. On each
side of it are a pair of short papillæ (aborted feet?)."
F. 16, 17. Last two pairs of legs. _od._ Oviduct. _ov._ Ovary. _ut._
Uterus. _v.c._ Nerve-cord.