12 TULLBERG, NEOMENIA. 



Fig. 17. Spine from the ridge of the back. viewed fi'om the grooved ! 



side. 



Fig. 18. Side view of the same. 



Fig. 19. Distal part of the same. 



Fig. 20. Grooved spine fi-om the side of the animal. 



Fig 21. Bridle-like spine. 



PLATE II. 



Fig. 22. Radial section of the integument ; a, homogeneous substance ; 

 b, e, cells in this tissue ; d, longitudinal muscle-fibres ; r, sec- 

 tions of muscle-fibres going obllquely outwards fi*om the ring- 

 muscle-layer ; /, radial fibres; (/, nerve; h, pigmented nerve- 

 cells; ;, bloodcanals. 



Fig. 23. Warts and spines from the surface of the integument. 



Fig. 24, 25, 26, 27. Cells from the integument. 



Fig. 28. Cells from the blood-canals. 



Fig. 29. Right lateral gland (a) with the common mushroom-shaped ef- 

 ferent duct (b). 



Fig. 30. Lower surface of the same duct. 



Fig. 31. Excrescences on this surface. 



Fig. 32. A transversal egg-lamlna from the ovary of a large specimen. 



Fig. 33. A part of the same laraina highly magnified. 



Fig. 34. Transversal lamina from a smaller specimen. 



Fig. 35. A part of the same. 



Fig. 36. Lateral cord-like organ; a, upper part: b, lower part; c. ä. 

 branches; e. stafflike bodies. 



Fig. 37. Lower part of the staff-like bodies highly magnilied; ^/, the coni- 

 cal staff; b, the furrowed. 



Fig. 38. Fibres from the cord-like organ. 



