Pomona College, Clareniont, California 77 
INDEX TO FIGURES 
Figure 1. Outline of the body and part of the legs of Trithyreus. XIO. 
Figure 2. Central nervous system removed. X20. 
Figures. Side view of methylene blue preparation showing position of the cells. X20. 
Figure 4. Dorsal view of Fig. 3. 
Figure 5. Cross section through the caudal region of the central nervous system. X75. 
Figures 6 to 9. Longitudinal sections through the cephalic ganglia. Cephalic side to the 
left, dorsal side up. Fig. 6, near the center, Figs. 7, 8, and 9 lateral 
sections. X75. 
