_p._ Common duct into which the vasa deferentia open. _p.c._ Posterior lobe of brain. _p.d.c._ Posterior commissure passing dorsal to rectum. _p.f._ Internal opening of nephridium into body-cavity. _ph._ Pharynx. _pi._ Pigment in outer ends of epidermic cells. _pi.r._ Retinal pigment. _p.n._ Nerves to feet. _p.p._ Primary papilla. _pr._ Prostate. R. Rectum. _Re._ Retinal rods. R. _m._ Muscle of claw. _s._ Vesicle of nephridium. _s_{1}. Part of 4th or 5th nephridium which corresponds to vesicle of other nephridia. _s.c._1. Region No. 1 of coiled tube of nephridium. _s.c._2. Region No. 2 of ditto. _s.c._3. Region No. 3 of ditto. _s.c._4. Region No. 4 of ditto. _s.d._ Salivary duct. _s.g._ Salivary gland. _sl.d._ Reservoir of slime gland. _sl.g._ Tubules of slime gland. _s.o._1, 2, 3, _&c._ Nephridia of 1st, 2nd, &c., feet. _s.o.f._ Terminal portion of nephridium. _s.p._ Secondary papilla. _st._ Stomach. _st.e._ Epithelium of stomach. _sy._ Sympathetic nerve running in muscles of tongue and pharynx. _sy´_. Origin of pharyngeal sympathetic nerves. T. Tongue. _t._ Teeth on tongue. _te._ Testis. _tr._ Tracheæ. _tr.c._ Cells found along the course of the tracheæ. _tr.o._ Tracheal stigma. _tr.p._ Tracheal pit. _ut._ Uterus. _v.c._ Ventral nerve cord. _v.d._ Vas deferens. _v.g._ Imperfect ganglia of ventral cord. PLATE 46. Fig. 1. _Peripatus capensis_, × 4; viewed from the dorsal surface. (From a drawing by Miss Balfour.) PLATE 47. Fig. 2. A left leg of _Peripatus capensis_, viewed from the ventral surface; x 30. (From a drawing by Miss Balfour.) Fig. 3. A right leg of _Peripatus capensis_, viewed from the front side. (From a drawing by Miss Balfour.) Fig. 4. The last left (17th) leg of a male _Peripatus capensis_, viewed from the ventral side to shew the papilla at the apex of which the accessory gland of the male, or enlarged crural gland, opens to the exterior. (From a drawing by Miss Balfour.) Prof. Balfour left a rough drawing (not reproduced) shewing the papilla, to which is appended the following note. "Figure shewing the accessory genital gland of male, which opens on the last pair of legs by a papilla on the ventral side. The papilla has got a slit-like aperture at its extremity." Fig. 5. Ventral view of head and oral region of _Peripatus capensis_. (From a drawing by Miss Balfour.) PLATE 48. Figs. 6 and 7 are from one drawing. Fig. 6. _Peripatus capensis_ dissected so as to shew the alimentary canal, slime glands, and salivary glands; x 3. (From a drawing by Miss Balfour.)