62 Journal of Entomology and Zoology 
characteristic positions. Also on the dorsal side there are two peculiar fiber masses in 
symmetrical positions. 
The pedal ganglion is small and just in front of the visceral. It is almost a 
part of the visceral and closely applied to it. It has two chief nerves on the cephalic 
side. Its central fibrous mass is slight. 
Explanation of Figures. 
Fig. 4. Chief ganglia of Piddock. ‘The cerebral ganglia are above, the vis- 
ceral mass with the small pedal ganglion attached below. X9. 
Fig. 5. One cerebral ganglion with part of the connective. X350. 
Fig. 6. One cerebral ganglion, a branch above, the connective to the left, the 
commissure branch to the right. X70. 
Figs. 7, 8 and 9. Sections through three levels of the visceral ganglion. The 
dorsal side is up. X70. 
Fig. 10. Section through the pedal ganglion with the two connectives as isolated 
pieces each side. The dorsal side is up. X70. 
