Fig. 52. Three cells of the digestive tube, to show the striations in the basal 

 portion. Compare with Figure 9 (Plate 1). X 830. 



Fig. 53. From an oblique frontal section of the eye seen from dorsal side, 

 showing that nerves leave the inner ends of the cells to make up 

 the optic nerve. X 830. 



Fig. 54. A cross section through the anterior part of the brain, to show the 

 28 fibres of the optic nerve within the brain. There is a mem- 

 brane on the dorsal and one on the ventral surface of the brain; 

 the latter separates the brain from the hypodermis. X 830. 



Fig. 55. The next section to Figure 51. The basal plate and a row of in- 

 terior bodies are shown. Two fibres leave the cell from a point, 

 on the periphery opposite to the basal plate. X 830. 



