90 Journal of Entomology and Zoology 



EXPLANATION OF PLATE 



Figure 1. Central nervous system of Orchestia. XIO. 



Figure 2. Surface view of one of the thoracic ganglia. X75. 



Figure 3. Surface view of one of the abdominal ganglia. X75. 



Figure 4. Longitudinal section through the brain. Caudal end to the top. X75. 



Figure 5. Longitudinal section of the brain; same as Fig. 4 but deeper. X75. 



Figures 6 and 7. Longitudinal sections of the second ventral ganglion. Caudal end 



at the top. X75. 

 Figure 8. Longitudinal section through the first ventral ganglion. Caudal end at 



top. X75. 



