58 



NKKXOUS SYSTEMS AM) SENSK ORCJANS 



In the female the central anal ganglion is the largest. It con- 

 nects with smaller lumbar ganglia out laterally and by a loop with 

 the recta! ganylion. 



In the male the anal ganglion is large, but the two lumbar are 

 nearly as large. Two rings of nerves are connected with the anal 

 ganglion and one with the small cloacal, and the other with the 

 rectal ganglion. 



GORDiODEA. Villott, 1874, shows that the ventral cord repre- 

 sents the central nervous system with an anterior and po.sterior 



V 



? 





Fife. 1". A-F. Nervous system of Goidoidea. A. Section through brain and 

 subocsophepeal band, much chanped from Montgomery. B. Petition 

 of supra and suboesophapeal panplion modified from Montpomery. 

 C. and D. Sections of vintr-il cord. E. and F. eras'; and longitudinal 

 sections of the ventral cord after May. G and H. Head of Chaetog 

 iinlhn after Hertwip, showinp brain, sense orpans and chief nerves. 

 I. Ventral panplion shown, Hertwip. J. Eye of Chactognatha. K. 

 Ganglion in body of Aciii'li'ircphalia after Leuchart. 



ganglion. In 1887 he traced fibers from the head ganglion into the 

 thickened hyrodermis of the head. Vejdovsky, 188,3, 1894, con- 

 siders that there is no cerebral ganglion and no ganglion cells on 

 the dorsal side of the peripharyngeal ganglion. He distinguishes 

 neuroglia cells. 



