356 OBSERVATIONS ON THE CHLORAEMIDAE. 



Fig. 7. — The same, from the side. 

 Fig. 8. — Ventral view of the same. 



Plate xxvii. 



Fig. 9. — Ventral seta of Goppingeria longisetosa, x 100. 



Fig. 10. — Ventral seta of Stylarioides ductus. 



Fig. 11. — Section of one of the shorter papillae of Coppingeria. 



Fig. 12. — Section through one of the longer papillae of the same: m., 



mucus ; g 2 ., g 3 ., ganglia. 

 Fig. 13. — A papilla of the same with the extremity inverted : m., mucus ; 



9 2 -, <J 3 -, ganglia. 

 Fig, 14. — Papilla of the same showing the basal ganglion, g l . ; cu., cuticle; 



mus., outer muscular layers of body wall. 



Fig. 15. — Section of the integument of Stylarioides cinctus : g'., basal 

 ganglia; m., layer of mucus; c'., external, and c" ., internal 

 layers of cuticle ; e. , epidermis ; mus. , muscular layer. 



Fig. 16. — Surface view of epidermal cells of Stylarioides cinctus. 



Figs. 17a and 17b. — Papilla of Stylarioides Horstii. 



Fig. 18. — From section of an elytron of a species of Polynoe, showing 

 sensory papilla : n., nerve-branch; g., ganglion. 



Fig. 19. — Papilla of Stylarioides monilifer : g'. , basal ganglion ; m., mucus. 



Fig. 20. — Transverse section of the anterior part of the body of Coppnngeria 

 longisetosa to show the position of the cardiac body: h., 

 "heart ;" cb., cardiac body ; vv., ventral vessel ; 02s., oesopha- 

 gus ; lm., longitudinal bundles of muscular fibres. 



Fig. 21. — Stomach, with oesophagus and beginning of intestine of Stylari- 

 oides cinctus. 



Fig. 22. — Part of a section through one of the nephridia of Goppingeria 

 longisetosa. 



Fig. 23. — Part of a section through nephridium of Siphonostomum ajffine. 



Plate xxviii. 



Fig. 24. — Anterior part of ventral chain of ganglia in Stylarioides cinctus : 

 c, commissures connecting cerebral and first ventral ganglia. 



Fig. 25. — Section (nearly transverse) through the preestomium of Coppin- 

 geria in the region of the cerebral ganglion (g ) : dr., two 

 main branches of the dorsal vessel ; br., afferent branchial 

 vessels; pi. s pigmented (?) cords accompanying branchial 

 vessels ; tv., tentacular vessel ; m., mouth. 



Fig. 26. — Section of eye of Goppingeria: cu., cuticle with its thickening 

 over the eye ; c, layer of modified epidermal cells ; r., crys- 

 talline rods ; pi., pigment cup ; g., nerve-cells. 



Fig. 27.— Section of eye of Siphonostomum affine : co., cornea-lens; pi., 

 pigment cup ; r., crystalline body. 



Fig. 28. — Lateral and ventral part of a transverse section through a 

 tentacle of Coppingeria : gr., ventral ciliated groove ; n., nerve. 



