CHAP. IV.] THE NERVOUS SYSTEM OF MOLLUSKS. 85 



The locomotions of Cuttle-fishes are largely brought 

 about by contractions of the pallial chamber, though these 

 same contractions of the pallium are also subservient, as 

 in the Nautilus, to the respiratory function. 



The large share, therefore, which the branchio-pallial 

 ganglia take in bringing about and regulating the move- 

 ments of these animals, would seem in part to explain the 

 connection of the ' auditory saccules ' with them, since in 

 the great majority of other Mollusks in which these 

 organs are known to occur, they are found to be in primary 

 relation with the principal motor centres. Whatever may 

 be the full explanation of these remarkable relations, the 

 fact remains that, even in the Cuttle-fish tribe, the super- 

 ficial connections of the so-called 'auditory saccules,' are 

 still away from the brain. 



