746 



ZOOLOGY 



SECT. 



The cerebral, pedal, and pkuro-visceral ganglia (Fig. 675.), all of 

 relatively large size, are closely aggregated together around the 

 oesophagus, supported and protected by the cranial cartilage. The 

 cerebral ganglia (cer. g.) are fused together into a rounded mass, 

 lodged in a hollow of the cranial cartilage, and covered over 



n t.c 



FIG. 671. Sepia cultrata, male specimen seen from the postero-veutral aspect, the 

 mantle-cavity opened as in Fig. 667, the posterior body-wall partly dissected off, so as to 

 expose the organs in the visceral sac, the ink-sac and duct removed, aort'. aboral aorta ; 

 app, appendage of left branchial heart ; ccec. caecum ; inf. cart, funnel cartilages ; liv. 

 digestive gland ; I. abd. v. left abdominal vein ; I. aff. br. left afferent branchial vessel ; I. aur. 

 left auricle ; /. br. ht. left branchial heart ; I. cten. left ctenidium ; I. neph. left kidney ; I. st. g. 

 left stellate ganglion ; mant. cart, mantle-cartilage ; mo. mouth surrounded by peristomial 

 membrane ; pen. penis ; prost. prostate ; r. abd. v. right abdominal vein ; r. cten. right 

 ctenidium ; reef, rectum ; r. ven. app. appendages of right afferent branchial vessel ; te. 

 testis ; te. v. vein to testis ; va. valve of funnel ; vent, ventricle. 



anteriorly by a strong fibrous membrane. Laterally are given off 

 a pair of short thick processes the optic nerves or optic stalks 

 (opt. st.) which expand almost immediately into large masses 

 the optic ganglia (opt. g.) in immediate contact with the eyes. 

 At the sides and posteriorly a pair of very thick commissural 



