BESPIRATOKY APPARATUS. 



579 



arrangement a very extensive surface is obtained, over which the blood 

 is diffused for the purpose of respiration. The respiratory apparatus is 

 lodged within the visceral sac, but separated from the other viscera by 



Fig. 290. 



Anatomy of the Cuttle-fish (after Hunter) : a cr, section of the mantle ; 6, c, ven cavse 

 d, spongoid appendages of ditto ; e e, branchial hearts ; m m, their lateral appendages 

 //, ligaments of branchiae; g, branchial organs; A, branchial vein; i i, systemic auricles 

 fc, systemic ventricle ; o, the stomach ; p, q, the ovaria. 



a membranous septum (fig. 289, t) ; so that a distinct chamber is formed 

 to contain the branchia), into which the water is freely admitted, the 

 surrounding element being alternately drawn into the branchial cavity, 



2 r 2 



