Ward. — Nectonema. 



PLATE III. 



Figs. 31-45. Transverse sections of the alimentary canal from a single series of 

 sections. Mayer's HCl carmine. Apochr. 4 mm. Compens. Oc. 4. 

 X 230. 

 Fig. 31. 7tli section of the series. 

 " 32. 16th " 

 " 33. 25th " 

 " 34. 31st " 

 " 35. 32d 

 " 36 38th " 

 " 37. 47th " 

 " 38. 48th " 

 " 39. 49th " 

 " 40. 50th " 

 " 41. 51st 

 " 42. 52d 

 " 43. 54th " 

 " 44. 55th " " " 



" 45. 103d " 

 Figs. 46-48. Transverse sections of alimentary canal from the region where it is 

 bounded by two cells alone to show diminution in size toward the pos- 

 terior end. Apochr. 4 mm. Compens. Oc. 4. X 230. 

 Fig. 46. Kleinenberg's hsematoxylin. 

 Figs. 47, 48. Ehrlich's hsematoxylin. 

 Fig. 49. Transverse section of alimentary canal to show the normal relation of 



the lumen to the cells. Kleinenberg's haematoxylin. 2. E. X 610. 

 Figs. 50, 51. Transverse sections of the oesophageal cell in the same series. Ehr- 

 lich's haematoxylin. 2. E. X 610. 

 Fig. 50. To show the relation of the nucleus to the chitinous tube. 

 Fig. 51. Two sections beyond the section in Fig. 50 to show disappearance of the 



chitinous tube. 

 Fig. 52. Lateral aspect of intestine. The two cells of the opposite side are not 

 shown. Ehrlich's hsematoxylin. 2. C. X 165. 



