ANAKTHROPODA. 



127 



CHAPTEE XII. 



ANAKTHROPODA. 



The Anarthro'poda or higher groups of the Worms have the body 

 distinctly segmented, but the segments are generally numerous (often 

 indefinite in number), and are mostly similar to each other excejot 

 at the two extremities of the body. Lateral appendages may be 

 wanting ; but when they are present, they are not articulated, nor 

 are they jointed to the body. The nervous system has the form of 



Fi^'. 8J. — Gepliyrea. SiputiQidiLS IndiciLS, of the natural size. (.Vfter Keferstein.) 



a ventral chain of ganglia, the first pair of ganglia lying above the 

 gullet. Cilia are generally developed. Theie is mj pi'oper heart or 

 system of blood-vessels ; but there is generally a system of tubes, 

 filled with a coloured fluid, often furnished with contractile dilata- 

 tions, and sending branches to the breathing organs, which take the 



