2C2 



SYSTEMATIC ZOOLOGY 



most important characteristics. The nervous system exhibits 

 a great concentration, all the chief ganglionic masses being 

 grouped in the head about the oesophagus and inclosed in a 



ma.Ttt.ca.rl 

 tirs 



FIR, 261. Sepia cultrata. Female, posterior aspect, with contents of mantle cavity exposed 

 by the division of its wall along the median line, ac.nid, accessory nidamental glands; 

 an, amis; / membrane attaching gill to wall of mantle cavity; in/, external opening of 

 funnel; inf.cart, infundibular cartilage; ink.s, ink sac; ink.d, ink duct; lig, cut ligament 

 passing from ovary to wall of mantle cavity; liv, liver; l.cten, left ctenidium or gill ; I.) 

 left nephridial aperture; l.nid, left nidamental gland; Lst.g, left stellate ganglion; tnant.cart, 

 mantle cartilage; mo, mouth ; tnus, neck musi - ovary; ovid, oviduct; red, rectum. 



1 \iiei- Parker and Haswell.) 



sort of internal skeleton of cartilage. In most of the Cephalo- 

 poda there is an ink gland, or ink sac, which generally opens 

 into or near the terminal portion of the alimentary canal. When 

 pursued or attacked by an enemy this ink or sepia is discharged 



