XII 



IMIYU'.M MOLM'SI A 



74(1 



cerebral) are connected by slender connectives with a pair of 

 stomatogastric ganglia (Fig. <>l>9, //. xlm.), ;ilso closely united, situated 

 on the posterior aspect of the oesophagus. Besides the ten brachial 

 nerves, each of which, expanding at the base of the arm into a 

 hrach'ial ganglion, runs along the axis of the arm to its extremity, 

 the pedal ganglia also give oft' nerves to the funnel, and also a 

 pair to the statocysts ; but the latter are found, when their fibres 

 are traced to their origin, to be derived from the cerebral ganglia. 

 The pleuro-visceral ganglia give off two visceral nerves (Fig. 676, 

 vise, n.) supplying the various internal organs, one pair of branches, 

 the branchials, having each a branchial ganglion at the base of the 



scl.cart 



set. carl 



orb.ccLrl 



Fit;. ()77. Sepia, section of eye. ell. proc. ciliary processes : corn, false cornea : ir. iris : 



lens; opt. a. optic ganglion; orb. cart, orbital cartilage; rWs. rods; r<i. retina : ./. cait. 

 M'lerutic cartilage. (From Vogt and Jung, after ll.-n^i-n.i 



ctenidium, and running along its axis to its extremity. Two other 

 ganglia of considerable size 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.} Avhich run through the 

 neck to the inner surface of the mantle-cavity, where each expands 

 into a large, flat, pallial or stellate ganglion (Fig. 667, I. st. 17.), which 

 is visible in front of the ctenidium when the mantle-cavity is opened. 

 From the outer edge of this arise a number of nerves supplying the 

 various parts of the mantle. 



The organs of special sense of the Cuttle-fish are much more 

 highly developed than those of Triton. The eyes ( Kiir. <'77) are 



VOL. I '* |! 



