414 



r/;:A.vsFOs^.v.! T/o.vs of ixsfcts. 



fibre which keeps the tubes open is found in both. The true insects 

 resemble the Myriapods in their vascular system, and in their 

 nervous system also. The ner\-ous s}'stem of the llyriapoda^ 

 as in all the Articuhita, exhibits a double series of ganglia, con- 

 nected by cords of intercommunication. The ganglia above the 

 oesophagus in the Myriapods is situated within the head, and 

 corresponds with the structure as seen in the lan\x of insects. 



Sco'Of-eudm mors: \iit <. 



The ganglia of the ner\'Ous chain which runs down the body, as in 

 insects, are numerous, in proportion to the number of segments ; 

 and they are ancII developed in Scolopcudra, whose legs are 

 long and powerful, and but feebly so in Juliis, whose locomotive 

 organs are small and weak. The organs of the senses of the 

 Myriapoda resemble those of insect larvai, but the most perfect 

 Scolopcudra does not present the complicated compound e}'e which 

 characterises the perfect butterfly or beetle. 



Wings are never met with amoncrst the class now under con- 



