abranchial f 



PHYLUM MOLLUSCA 



719 



a branchial ganglion at the base of the ctenidium, and running along 

 its axis to its extremity. Two other ganglia of considerable size 



Fic.-:628. Sepia cultrata, heart and main blood-vessels from the posterior aspect, (tort, aorta ; 

 ajo't't'. aboral aorta ; <i/>p. appendage of right branchial heart ; eff. l>r. r. right efferent branchial 

 vessel ; Ink . artery to ink-sac ; ink. r. vein from ink-sac ; /. riff. br. r. left afferent branchial 

 vessel ; 1. aur. left auricle ; oc. v. deep ovarian vein ; ov. v'. superficial ovarian vein ; pall. v. 

 pallial vein ; r. abil. v. right abdominal vein ; r. aff. br. r. right afferent branchial vein ; 

 r. </< ii. right ctenidium ; /. br. lit. right branchial heart ; v. car. vena cava ; ren. app. venous 

 appendages ; rent, ventricle. 



FIG. 629. Sepia cultrata, cephalic gang- 

 lia from the anterior aspect, ao. aorta ; 

 hue. buccal ganglion ; ctr. buc. con. cere- 

 bro-buocal connective ; cer. g. cerebral 

 ganglion ; opt. g. optic ganglion (removed 

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

 /Mill. n. pallial nerve ; pi. g. pleural gang- 

 lion ; rise. n. visceral nerves. 



VLSC.7L 



FIG. 630. Sepia cultrata, anterior view 

 of pedal and pleuro-visceral ganglia after 

 removal of the cerebral and optic; //,-. re. 

 brachial nerves; conn, connectives be- 

 tween the cerebral and the pedal and 

 pleuro-visceral ganglia (cut across) ; <',?/! ,i. 

 nerve to funnel; pall. ,i_. pallial nerves; 

 rise. n. visceral nerves. 



the visceral and the gastric occur in the course of this system. The 

 pleuro-visceral ganglia also give off two very stout pallial nerves 

 (pall.n.) which run through the neck to the inner surface of the 



