Wabd. — Nectonema. 



Fig. 



63. 



rig- 



64. 



Fig. 



65. 



Fig. 



66. 



Fig. 



67. 



Fig. 



68. 



Fig. 



69, 



Fig. 



70. 



Fig. 



71. 



PLATE V. 



Ventral aspect of head with brain, viewed as a transparent object in clove 

 oil. 2. C. X 160. 



Nucleus of dorsal cell showing enclosed body {x). Bohmer's haematoxy- 

 lin. Apochr. 4 mm. Corapens. Oc 8. X 680. 



Nucleus of dorsal cell. Kleinenberg's haematoxylin. Apochr. 4 mm. 

 Compens. Oc. 8. X 680. 



More regular nucleus of dorsal cell. Ehrlich's hasmatoxylin. Apochr. 

 4 mm. Compens. Oc. 8. X 725. 



Oblique section through basal portion of dorsal cell where the process 

 enters and divides. Bohmer's haematoxylin. Apochr. 4 mm. Com- 

 pens. Oc. 8. X 725. 



Small nervous nuclei of brain. Ehrlich's haematoxylin. Apochr. 4 mm. 

 Compens. Oc. 4. X 360. 



Nucleus of commissural cell showing enclosure similar to that of the dor- 

 sal cell. Bohmer's haematoxylin. Apochr. 4 mm. Compens. Oc. 4. 

 X 360. 



Nucleus of large ganglion cell in anal ganglion. Bohmer's haematoxylin. 

 Apochr. 4 mm. Compens. Oc. 8. X 725. 



Nuclei of cells in peripheral layer of anal ganglion. Ehrlich's haematoxy- 

 lin. Apochr. 4 mm. Compens. Oc. 8. X 725. 



