370 



MOLLUSC A. 



tvith ganglionic cells but at most very slightly developed 

 ganglia, tvhich run the whole length of the body. Of these 



Fig. 162. — Chiton. 

 After Prgtre. 



s,rc 



Fig. 163. — Dorsal view 

 of nervous system of 

 Chiton. — After Pel- 

 seneer. 



c, Cerebral commissure ; 

 g. , gut (above all the com - 

 missures except cerebral 

 and supra-rectal) ; pa., 

 pallial or visceral loop, 

 with supra - rectal com- 

 missure (s.r.c.) ;/., pedal 

 nerves united by numer- 

 ous transverse branches ; 

 s.g., stomato-gastric com- 

 missure ; s.r. t subradular 

 commissure ; /., labial 

 commissure ; v. , visceral 

 commissure. 



id§. 



la. 



/ 



/ 





yo? 



b.v.g. 



Fig. 164. — Proneomenia. Ner- 

 vous system. — From Hub- 

 recht. 



e.g.. Cerebral ganglia ; slg. } sub- 

 lingual ; a.p.g., anterior pedal ; 

 i>-P>g>^ posterior pedal; p.v.g., 

 posterior viscerals ; si., sublingual 

 connectives ; cpc, cerebro-pedal 

 connective;^., longitudinal pdal 

 nerves ; la. t longitudinal lateral 

 nerves. 



