Figs. 11-16. A series of six transverse sections through the head of
_Peripatus capensis._
Fig. 11. The section is taken immediately behind the junction of the
supra-oesophageal ganglia, _c.g._, and passes through the buccal cavity,
M., and jaws, _o.j._ and _i.j._
Fig. 12. The section is taken through the hinder part of the buccal cavity
at the level of the opening of the mouth into the pharynx and behind the
jaws. The cuticular rod-like continuation (_le._) of the inner jaw lying in
a backwardly directed pit of the buccal cavity is shewn; on the right hand
side the section passes through the opening of this pit.
Fig. 13. The section passes through the front part of the pharynx, and
shews the opening into the latter of the median backward diverticulum of
the mouth (M{1}), which receives the salivary ducts. It also shews the
commencement of the ventral nerve-cords, and the backwardly projecting
lobes of the brain.
Fig. 14. The section passes through the anterior part of the pharynx at the
level of the second commissure (_co._ 2), between the ventral nerve-trunks,
and shews the mass of cells developed on this commissure, which is in
contact with the epithelium of the backward continuation of the buccal
cavity (M{1}).
Fig. 15. Section through the point of junction of the salivary ducts with
the median oral diverticulum.
Fig. 16. Section behind the pharynx through the oesophagus.
_b.c._ Body-cavity. C. Cutis. _c.b.c._ Central compartment of body-cavity.
_c.g._ Supra-oesophageal ganglia. _c.m._ Layer of circular muscles. _co._
Commissure between ventral nerve-cords. _co._ 2. Second commissure between
the ventral nerve-cords. _co{1}._ 2. Mass of cells developed on second
commissure (probably sensory). _c.s.d._ Common duct for the two salivary
glands. _d.l.m._ Dorsal longitudinal muscles of pharynx. _d.o._ Muscles
serving to dilate the opening of the pharynx. _Ep._ Epidermis. _e.n._ Nerve
passing outwards from ventral nerve-cord. H. Heart. _i.j._ Inner jaw.
_j.p._ Jaw papillæ. _L._ Lips of buccal cavity. _l.b.c._ Lateral
compartment of body-cavity. _le._ Rod-like cuticular continuation of inner
jaw, lying in a pit of the buccal cavity. _l.m._ Bands of longitudinal
muscles. M. Buccal cavity. M{1}. Median backward continuation of buccal
cavity. _m.l._ Muscles of jaw lever. _m.s._ Muscular sheets passing from
side walls of pharynx to dorsal body-wall. _oe._ OEsophagus. _oes.co._
OEsophageal commissures. _o.j._ Outer jaw. _ph._ Pharynx. _s.d._ Salivary
duct. _s.g._ Salivary gland. _sl.d._ Reservoir of slime gland. _sy._
Sympathetic nerves running in muscles of tongue or pharynx. _sy{1}._ Origin
of sympathetic nerves to pharynx. T. Tongue. _v.c._ Ventral nerve-cords.
Figs. 17, 18. Two longitudinal horizontal sections through the head of
_Peripatus capensis_. Fig. 17 is the most ventral. They are both taken
ventral to the cerebral ganglia. In Fig. 17 dorsal tracheal pits are shewn
with tracheæ passing off from them. (Zeiss a a, Hartnack's camera.) C.
Cutis. _c.s.d._ Common salivary duct. _ep._ Epidermis. _i.j._ Inner jaw. M.
Buccal cavity. M{1}. Median backward diverticulum of mouth. _o.j._ Outer
jaw. _s.d._ Salivary ducts. T. Tongue. _t._ Teeth on tongue. _tr._ Tracheæ.
_tr.p._ Tracheal pits.