Notes on the Physiology of Charybtlea rastonii. 1 1 



6. Fatigue comes to the pedalial muscles after 14-16 contrac- 

 tions as tested ])y the rhopalinm-pedalium reflex. 



7. The mouth edge spreads out, if the lower region of the 

 subumblella near the velalium is stroked. 



8. The phacelLne of Charyhdea rastonii are 9-10 in number 

 in each intei'radial corner of the gastral cavity and are arranged 

 at irregular intervals. Each is not dendritic, but is composed of 

 a very elastic stalk and a terminal tuft. 



Zoological Institute, 



Tokyo Imperial University, 

 :\rarcli 9, 1917. 



