240 Henry LesLie OsBorx, 
Fig. 17. Section in the centre of the mouth, prepharynx and 
pharynx, passing in the plane of their centre, horizontally. 200: 1. 
Fig. 18. Section of wall of pharynx, oesophagus and intestine, 
showing the relation of the cuticle to the epithelium. 440: 1. 
Fig. 19. Intestinal epithelium cells cut longitudinally, iron-haema. 
567.21. 
Plate 14. 
Fig. 20. From a section of the wall of the intestine in the muscle 
layer, showing the muscle fibres. 720:1. 
Fig. 21. Section in the plane of the excretory pore, showing the 
surface cuticle and its continuation in the excretory bladder. 
Fig. 22. Horizontal section in the plane of the excretory bladder 
and collecting vessel. 425: 1. 
Fig. 23. Cells in the wall of the excretory bladder, showing the 
degenerating nuclei iron-haema. 850: 1. 
Fig. 24. The wall of the collecting vessel, in longitudinal section. 
85071: 
Fig. 25. Main vessels of the excretory system as seen in living 
compressed specimen, at place where the branching takes place, the arrows 
show the direction of the current. 
Fig. 26. View of living specimen showing the relation of the flame 
cells and capillaries to the larger vessels. 850:1. 
Fig. 27. View of the collecting and recurrent vessels at their 
junetion and of a capillary crossing them. 850:1. 
Fig. 28. Ciliary organ as seen in the living vessel. 850:1. 
Fig. 29. Flame cell and capillary, from living compressed specimen. 
850 : 1. 
Fig. 30. Horizontal section in plane of the nerve centres and eye. 
160: 4. 
Fig. 31. Section in plane of centre of eye, showing its relation to 
the lateral nerve. 1500: 1. 
Fig. 32. End views of cuticular sense organs, from tangential section 
of the cuticle, head end of animal. 850: 1. 
Fig. 33. Section passing in the length of one of the cuticle sense 
organs. 1600:1. 
Fig. 34. Section passing in the length of one of the marginal-sense 
organs. 850: 1. 
Fig. 35. The outer organs of the reproductive system, from adjoining 
sections passing through them lengthwise. 350: 1. 
Fig. 36. The sperm duct and spermatic vesicle at their junction, 
from living compressed specimen. 
