oxide. The nerve is clearly shown leaving the cell from a point 

 on the periphery opposite to the basal plates. The interior 

 bodies are arranged in typical fashion. Figure 19 is ventral to 

 Figure 20. X 665. 



Fig. 21. The entire eye seen from the ventral side. Vom Rath's fluid 18 

 hours; pyroligneous acid 4^ hours; decolorized in hydrogen 

 peroxide. The ventral ocellus, the boundaries between its cells, 

 and the nuclei are shown by sharp dark outlines. The prepara- 

 tion is slightly distorted by pressure. The typical and general 

 arrangement of the interior bodies as described in the text is 

 well shown. X485. 



Fig. 22. The eye, entire, from the dorsal side. Vom Rath's fluid following 

 formalin. Ten nuclei are shown in the ventral ocellus, nine in 

 each of the lateral ocelli. The nuclei which are shown in black 

 lie at the highest focus, those with palest tint at deepest focus; 

 the nuclei of the ventral ocellus are merely outlined. X 560. 



Fig. 23. Cross section of the eye, seen from in front. Zenker's fluid; iron- 

 haemotoxylin. Shows the striation of the basal portion of the 

 retinal cells, also the interior bodies, the basal plates and the pig- 

 ment cell. X 665. 



Fig. 24. Anterior part of brain seen from dorsal side. Vom Rath's fluid one 

 hour; pyroligneous acid one hour; decolorized in hydrogen per- 

 oxide. The organs of Claus are shown in position at the front 

 lateral margin of the brain, near the antennal nerve. The optic 

 nerve is median. X 270. 



