+2 NERVOUS SYSTEM AND SENSE ORGANS 



ning through the body, especially two thick ones. Moniez, 1881, 

 found the commissui'es in the forward end of the body. 



Lang, 1879-82, figures and describes the nervous system of a 

 member of the Cestoda where he finds a concentration in the scolex 

 region and nerves running from this center to the appendages in 

 this region when present and also long nerves which run the length 

 of the body. 



Roboz, 1882, shows the central ganglion and an extensive nerve 

 network in cestodes. Some authors claim to have seen ganglion cells 

 along the nerve strands and in fact Kahne considers the chief longi- 

 tudinal strands as central organs. 



Haman, 1885, also describes the long nerve fibers as having 

 ganglion cells on them. 



Niemeic, 1886, in Li(/ula shows a central ganglionic mass with 

 two thick strands leading from it and four or more smaller ones, 

 some of which branch again. Blanchard found similar conditions. 



In Schlistvcephaliis, Moniez gives a brief description of the 

 nervous system also Niemiee, 1886. 



In BvtliriuceijIialKK. Niemiee gives some indications of commis- 

 sures in the scolex region. 



In Taenia, Blanchard gives some indication and Moniez dis- 

 tinguishes a nerve ring in the tip of the scolex. Blumberg, 1877, 

 finds a larger number of longitudinal nerves than the last author 

 and Nitsche finds ten strands from the neck region of Taenia. 



Niemiee, 1886, finds a nerve ring in the rostellum and eight 

 nerves coming from the ring. As each one leaves there is a 

 swelling on the ring with small ganglion cells. A commissure sur- 

 rounds the central ganglion. Other commissures were also found 

 in this region. 



In ArantliDhi.tln iiivi I'intner. 1881. was one of the fir.st to de- 

 .scribe the nervous system. Niemiee shows it with branches to the 

 forward region, a ring commissure below the main ganglion and 

 with two thick and other thinner longitudinal .strands. 



In Tetrarlnpirlnis Lang. '82, was one of the early students. 

 Figure 11-L, is from another species which resembles the condition 

 in Tetrarliynclius. 



The nerve cells of Cestoda differ greatly in size. Niemiee gives 

 figures from the cells and nuclei of a number of species. He finds 

 them to be from 12x16 microns to 28x34 microns cell body; 

 nucleus, 5x8 microns to 9x13 microns. 



Among the more recent literature is the work of Tower, 1900, 

 on M'Diiezia. The complicated nervous system of this species is 

 shown in Fig. 11, A. 



