MYRIOPODA. 

 MYRIOPODA. 



257 



Centipedes. 

 Chilopoda. 



Millipedes. 

 DiPLOPODA (or Chilognatha). 



Carnivorous. 

 Poisonous. 

 Body usually flat. 



A pair of appendages to each 

 segment. 



Many-jointed antenna;. 



Toothed cutting mandibles. 



Each maxilla consists of an ex- 

 ternal palp, and a bi-lobed median 

 portion. 



The next appendage is leg-like. 

 Then follows a large basilar plate, 

 beside which are the two poison- 

 claws. 



A single posterior genital aper- 

 ture. 



Examples — Scolopendra. 



Vegetarian. 

 Harmless. 

 Body cylindrical. 



By the imperfect separation of the 

 segments all but the most anterior 

 seem to have two pairs of append- 

 ages each, and also two paired 

 ganglia, and two pairs of stigmata. 



Seven-jointed antennae. 

 Broad masticating mandibles. 

 Maxillse are represented by a 

 four-lobed plate. 



No basilar plate. 



Genital apertures open on 

 second or third pair of limbs. 



Examples— y»/«j. 



the 



As distinct from these two sub-classes, it is perhaps necessary 

 to recognise other two — Pauropoda, e.g., Pauropus, and 

 Symphyla, e.g., Scolopendrella. 



Third Class of Tracheata. Insecta. 



It is said that there are about two milUon species of living 

 animals, and that almost half of these are Insects. 



Insects occupy a position among the backboneless animals 

 like that of birds among the Vertebrates. The typical 

 members of both classes have wings and the power of true 

 flight, richly aerated bodies, and highly developed nervous 

 and sensory organs. Both are very active and brightly 

 coloured. They show parallel difierences between the sexes, 

 and great wealth of species within a narrow range. 



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