EXPLANATION OF THE PLATES. 



ant, anterior part of figure. 

 post, posterior ,, ,, 



prox, proximal ,, ,, 



clist, distal ,, ,, 



jMuscles are coloured yellow. 



All figures, excepting figs. 8-10, 15, 18-20, and the diagrams (figs. 1-5, 24), were 

 drawn by means of Winkel's drawing apparatus.) 



Plate X. 



Figs. 1-5. Diagrams of various Onychophora, showing the pregenital, genital, 

 and postgenital segments of the s from the ventral surface. The genital 

 opening is represented as a cruciform opening in all. ac. g, accessory glands of 

 postgenital segments, cr^, openings of the crural glands of the pregenital seg- 

 ment, cr-, openings of the crural (accessory) glands of genital segment, ex, 

 coxal organs. 7i% nephridial opening on pregenital segment, n'^, nephridial 

 opening on iwstgenital segment. 



Fig. 6. Inner jaw of 0. cinctipes from Richmond. 6a, outer jaw of same 

 specimen. 



Fig. 7. Genital opening of ? and <j of 0. cinctipes (spirit specimens from 

 Dunbrody) ; the arrow indicates the median line and the anterior direction. 



Fig. 8. Papillae of 0. cinctipes ; the 3 large papillae from legs (a) and from sides 

 of body (b, c) of drowned specimen ; the small papilla, d, from a spirit specimen. 



Fig. 9. Outline of large papilla from sides of body of P. halfouri. 



Pig. 10. Outline of large papilla from sides of body of P. capensis. 



Fig. 11. Ventral view of posterior end of a (? of 0. cinctipes from Richmond 

 ^drowned); the papillae are carefully drawn in their natural positions, cic.g^, 

 l^apilla bearing the external opening of anterior accessory gland, ac. g^, papilla 

 bearing the external opening of posterior accessory gland, an, anus, ex, 

 coxal organ, g.2}, one of the 4 papillte round the genital opening, n, nephridial 

 opening. 



Fig. 12. The 3 spinous pads of 5th right leg of O. cinctipes ( ? from Dunbrody, 

 in spirits), n, opening of the nephridium. 



Fig. 13. The coxal organ on 8th left leg of large ? 0. cinctipes from Dunbrody, 

 showing the organ as it often appears in spirit specimens, ex, the evaginated 

 peripheral portion of the epithelium with smooth cuticula ; cx^, invaginated 

 central portion of this epithelium ; ep, ordinary, echinate, papuliferous epithelium 

 of the surrounding skin. 



Fig. 14. 12th right leg of i O. cinctipes irom Richmond, ventral view (drowned 

 specimen), cr, fully expanded coxal organ, forming a bulging convexity, r./, 

 ring-shaped fold enclosing the papilla at the apex of which the crural gland 



