EXPLANATION OF PLATES. 919 



the enlarged crural gland of the lyth leg (f. gl.). (Zeiss a a, Hartnack's carmrn.} a-g. 

 accessory gland of male (modified crural gland of last leg). C. Cutis. cl. Claw. 

 eu. Cuticle, ep. Epidermis, f-gl- Crural gland, h. Cells in lateral compartment of 

 body cavity, o.f. g. Orifice of accessory foot gland, o. s. Opening of segmental 

 organ. P. Three spinous pads on ventral surface of foot. pr. Prostate. R. M. 

 Retractor muscle of claw. s. Vesicle of nephridium. s. c. i. Region No. i of coiled 

 part of nephridium. si. g. Tubule of slime gland, s. o. t. Terminal portion of nephri- 

 dium. st. Stomach, st. e. Epithelium of stomach, v. c. Ventral nerve-cord, v. d. 

 Vas deferens. 



Fig. 21. "Longitudinal vertical section through the supra-cesophageal ganglion 

 and cesophageal commissures of Peripatus capensis. (Zeiss a a, Hartnack.)" at. An- 

 tenna, e. Central lobe of white matter. /. Part of jaw. s.g. Salivary gland. 



Fig. 22: drawn by Miss Balfour. Brain and anterior part of the ventral nerve- 

 cords of Peripatus capensis enlarged and viewed from the ventral surface. The paired 

 appendages (d) of the ventral surface of the brain are seen, and the pair of sympathetic 

 nerves (sy 1 ) arising from the ventral surface of the hinder part. 



From the commencement of the cesophageal commissures (as. co. ) pass off on each 

 side a pair of nerves to the jaws (/. .). 



The three anterior commissures between the ventral nerve-cords are placed close 

 together; immediately behind them the nerve-cords are swollen, to form the ganglionic 

 enlargements from which pass off to the oral papilla; a pair of large nerves on each 

 side (or. n.) 



FiL-hind this the cords present a series of enlargements, one pair for each pair of 

 feet, from which a pair of large nerves pass off on each side to the feet (p. n). at. n. 

 Antennary nerves, co. Commissures between ventral cords, d. Ventral appendages 

 of brain. E. Eye. e. n. Nerves passing outwards from ventral cord. F.g. Gan- 

 glionic enlargements from which nerves to feet pass off. j. n. Nerves to jaws. or. g. 

 Ganglionic enlargement from which nerves to oral papilla; pass off. or. n. Nerves to 

 oral papillae.' p.c. Posterior lobe of brain, p. n. Nerves to feet. s.y. Sympathetic 



Fig- 23. "Longitudinal horizontal section through the head of Peripatus capensis ; 

 shewing the structure of the brain, the antennary and optic nerves, &c. (Zeiss a a, 

 Hartnack's camera.)" at. Antenna, at. n. Antennary nerve, cor. Cornea, e. 

 Central mass of white matter. /. Lens. op. n. Optic nerve, ph. Pharynx. /./. 

 Primary papilla covered with secondary papillae and terminating in a long spine. Sy. 

 Pharyngeal sympathetic nerves. 



Fig. 24. "Eye of Peripatus capensis, as shewn in a longitudinal horizontal section 

 through the head. The figure is so far diagrammatic that the lens is represented as 

 filling up the whole space between the rods and the cornea. In the actual section 

 there is a considerable space between the parts, but this space is probably artificial, 

 being in part caused by the shrinkage of the lens and in part by the action of the 

 razor. (Zeiss c, Hartnack's camera.)" (It appears that the ganglionic region of the 

 eye is covered by a thin capsule, which is omitted in the figure. ) 



cor. Cornea. /. Lens. op. Optic ganglion, op. n. Optic nerve. //'. r. Pigment. 

 Re. rods. s. p. Secondary papillae. 



