Pomona College, Claremont, California 



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Fig. 16. Cerebral ganglion, section. The commissure shows. X70. Sunset clam. 

 Fig. 17. Longitudinal section of a pedal ganglion. X70. Sunset clam. 

 Figs. 18, 19, 20, 21. Various sections of visceral ganglion. The dorsal side is 

 up. X70. Sunset clam. 



