28 Journal of Entomology and Zoology 
Explanation of Figures 
Fig. 1. Central ganglia of Mytilus. The cerebral ganglia are above in the fig- 
ure. X6, 
Fig. 2. Longitudinal section of the cerebral ganglion of Mytilus. The connec- 
tive end is down. X70. 
Fig. 3. Cross section of the cerebral ganglion of Mytilus. The dorsal side 
is up. X70. 
Fig. 4. Cross section of the pedal ganglion of Mytilus. The dorsal side is up. 
X70. 
