748 



ZOOLOGY 



SECT. 



Besides the optic nerves the cerebral ganglia also give off a pair 

 of slender nerves which join a smaller pair of closely united buccal 



a or I 



FIG. 674. Sepia cultrata, lieart and main blood-vessels from the posterior aspect, ant. ao, 

 aort. aorta ; aort'; aboral aorta ; app. appendage of right branchial heart ; eff. br. v. right 

 efferent branchial vessel ; ink. a. artery to ink-sac ; ink. v. vein from ink-sac ; L aff. br. v. 

 left afferent branchial vessel ; 1. aur. left auricle ; ov. v. deep ovarian vein ; ov. v'. superficial 

 ovarian vein ; pall. v. pallial vein ; r. abd. v. right abdominal vein ; r. aff. br. v. right afferent 

 branchial vein ; r. cten. right ctenidium ; r. br. ht. right branchial heart ; v. cav. vena cava ; 

 ven. app. venous appendages ; vent, ventricle. 



br. n. 



FIG. 675. Sepia cultrata, 'cephalic 

 ganglia, from the anterior aspect, ao. 

 aorta ; buc. buccal ganglion ; cer. buc. con. 

 cerebro-buccal connective ; cer. g. cere- 

 bral ganglion ; opt. g. optic ganglion (re- 

 moved on the left side) ; opt. st. optic 

 stalk ; pall. n. pallial nerve ; pi. g. pleural 

 ganglion ; vise. n. visceral nerves. 



FIG. 676. Sepia cultrata, anterior view 

 of pedal and pleuro-visceral ganglia after 

 removal of the cerebral and optic, br. n. 

 brachial nerves ; conn, connectives be- 

 tween the cerebral and the pedal and 

 pleuro-visceral ganglia (cut across) ; inf. n. 

 nerve to funnel ; pall. n. pallial nerves ; 

 vise. n. visceral nerves. 



ganglia (Fig. 675, buc.), situated close to the buccal mass on the 

 anterior aspect of the oesophagus. The buccal ganglia again 

 (which are sometimes looked upon as separated portions of the 



