THE CRANIAL GANGLIA IN AMEIURUS 



321 



TABLE II 



Showing the components of the Vth to Xth ganglia in Ameiurus; compiled from Her- 

 rick's ('01) description. The presence of any component is indicated by "pres," ' 

 or by the name of the ganglion. The jugular and lateralis Xth are placed over 

 the third and fourth epibranchial ganglia of the Xth not to indicate their seg- 

 mental position but because this is their relative position. 



This table is slightly different from Herrick's description. There 

 is a lateralis ganglion in the region of the IXth nerve which he 

 seems to attribute ('01, p. 208) morphologically to the Xth, 

 although it is associated with the root of the IXth. I find it to be 

 entirely distinct in origin from the Xth nerve and have placed it 

 in the diagram with the IXth. The general cutaneous ganglia 

 are found in the Vth and Xth nerves. The acustico-lateralis 

 ganglia are found in the Vllth, where there are two divisions, the 

 dorso-lateral and the ventro-mesial ; and in the Vlllth, IXth, and 

 Xth. The visceral ganglia are found in the Vllth, IXth and in 

 the four branchial ganglia of the Xth. The jugular or general 

 cutaneous Xth and the lateralis Xth are placed in the diagram 

 over the last epibranchial ganglion of the Xth, not to indicate 

 their segmental position but because they form the posterior 

 portion of the vagus ganglion. Attention will be called later in 

 the body of the paper to the fact that this table makes no distinc- 

 tion between the general and special visceral ganglia, both being 

 catalogued as the visceral sensory or communis system, although 

 Herrick distinguishes the two groups functionally and further 

 distinguishes the two types of fibres structurally. 



