60 Journal of Entomology and Zoology 
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Fig. 11. Cerebral ganglia. X9. Sunset clam. 
Fig. 12. Pedal ganglion. X9. Sunset clam. 
Fig. 13. Visceral ganglion from the side. (a) Connective branch, (b) dorsal 
branch, (c) gill branch, (d) branch to posterior adductor muscle, (e) mantle branch, 
(f) mantle and ventral siphon branch, (g) small mantle branch ?, (h) mantle and 
dorsal siphon branch. Sunset clam. 
Figs. 14 and 15. Other views of the visceral ganglion, lettering as in Fig. 3. X9. 
